Volume Control Dampers Remotely Operated Balancing Dampers ...

Volume Control Dampers 

Remotely Operated Balancing Dampers 

Solo-Control TM 

Air Volume Control System 

Fire/Smoke Dampers 

Blast Dampers 

Metropolitan Air Technology (MAT) was founded in 1992 to bring to 

market a newly patented concept in the field of manually controlled, 

remotely operated air volume balancing dampers. Remotely operated 

balancing dampers are required in installations where the balancing 

damper is inaccessible for direct manual adjustment due to drywall 

ceilings, high ceilings, or interference from other mechanical systems. 

In response to market demand for a full commercial damper line, we 

expanded our offering with the introduction of a line of volume control 

dampers and a UL classified line of fire/smoke dampers. 

We’re committed to the continuous evolution of our products, stellar 

customer service, and a top-notch quality management system. As a 

member of the U.S. Green Building Council, we monitor changes and 

trends within the green building industry to help identify our customer’s 

future needs and enhance our product development efforts. 

Our products are manufactured in the USA and sold in North America and 

international markets. 

MAT products are protected by US and International patents. 

Trump Tower 

Chicago, Illinois, USA 

American Made. 

World Proven.

Fire Dampers 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 

American Made. World Proven. 

Fire, Smoke & Radiation 

Dampers 

Model 

FD-SALB Curtain Fire Damper/Static P-1 

FD-SB Curtain Fire Damper/Static P-2 

FD-SC Curtain Fire Damper/Static P-3 

FDD-SALB Curtain Fire Damper/Dynamic/Static P-4 

FDD-SAB Curtain Fire Damper/Dynamic/Static P-5 

FDD-SC Curtain Fire Damper/Dynamic/Static P-6 

FD-ALB Curtain Fire Damper/Static P-7 

FD-B Curtain Fire Damper/Static P-8 

FD-C Curtain Fire Damper/Static P-9 

FDD-ALB Curtain Fire Damper/Dynamic/Static P-10 

FDD-B Curtain Fire Damper/Dynamic/Static P-11 

FDD-C Curtain Fire Damper/Dynamic/Static P-12 

FD-ASL (OW) Slimline Curtain Fire Damper/Static P-13 

FD-BSL Slimline Curtain Fire Damper/Static P-14 

FD-AUSL Ultra Slimline Curtain Fire Damper/Static P-15 

FDD-ASL (OW) Slimline Curtain Fire Damper/Dynamic/Static P-16 

FDD-BSL Slimline Curtain Fire Damper/Dynamic/Static P-17 

FD-ACMH Curtain Fire Damper-Caulk Sealed/Static P-18 

FD-ACHP Curtain Fire Damper-Welded/Static P-19 

FD-SAVG Curtain Fire Damper-Behind Grille/Static P-20 

FDD-SAHG Curtain Fire Damper/Dynamic/Static P-21 

FDD-SAVG Curtain Fire Damper/Dynamic/Static P-22 

FD-SAHG Curtain Fire Damper-Behind Grille/Static P-23 

FD-AOW Curtain Fire Damper/Static P-24 

FDD-AOW Curtain Fire Damper/Dynamic P-25 

FD-R (Static), FDD-R Dynamic True Round P-27 

FD 110-3V (OW-) (-CR) Multi Blade/Static P-28 

FD-160-AF (OW-) (-CR) Multi Blade/Static P-29 

FDD 110-3V (OW-) (-CR) Multi Blade/Dynamic/Static P-30 

FDD-160-AF (OW-) (-CR) Multi Blade/Dynamic/Static P-31 

FD-A-3V Curtain Fire Damper/Static P-32 

FD w/ Micro Switch for Status Control or Shut Off P-33 

ANG-Framed Retaining Angle Installation P-34 

General Installation Instructions P-35 

Out of Wall/Partition Installation Instructions P-36 

FD-R & FDD-R Installation Instructions P-37 

Supplemental Installation Instructions P-38 

Support Mullions Installation Instructions P-39 

Combination Fire/Smoke Dampers 

F/S-3V-I & F/S-3V-3-I 3V Blade P-40 

F/S-3V-II & F/S-3V-3-II 3V Blade P-41 

F/S-AF-I & F/S-AF-3-I Airfoil Blade P-42 

F/S-AF-II & F/S-AF-3-II Airfoil Blade P-43 

F/S-RD-I True Round P-44 

F/S-RD-II True Round P-45 

F/S-3V-FA-I 3V Blade-Front Access P-46 

F/S-3V-FA-II 3V Blade-Front Access P-47 

F/S-3V-OW-I 3V Blade-Out of Wall P-48 

F/S-3V-OW-II 3V Blade-Out of Wall P-49 

F/S-AF-OW-I Airfoil Blade-Out of Wall P-50 

F/S-AF-OW-II Airfoil Blade-Out of Wall P-51 

F/S-AF-FA-I Airfoil Blade-Front Access P-52 

F/S-AF-FA-II Airfoil Blade-Front Access P-53 

F/S-3V-CR-I Corridor Damper P-54

Combination Fire/Smoke Dampers (continued) 

F/S-3V-CR-II Corridor Damper P-55 

Basic Installation Instructions P-56 

Out of Wall Installation Instructions P-57 

F/S-RD Installation Instructions P-58 

F/S-3V-CR-I (II) Installation Instructions P-59 

Model ANG-RetainingAngles P-60 

STO/R-Single Thermostat Operator Release P-61 

DTO/R-Double Thermostat Operator Release P-62 

EFL-Electric Fuse Link P-63 

PFL-Pneumatic Fuse Link P-64 

M/S Micro Switch Package P-65 

RCB-Remote Control Box P-66 

Motor/Actuators P-67 

Smoke Detectors P-68, 68B, 68C 

Supplemental Installation Instructions P-69 

Damper Enclosures & Transitions P-70 

Damper Operators P-71 

Support Mullions Installation Instructions P-72 

Typical Motor Mount Locations P-73 

Duct Mounted Smoke Detector Detail P-74 

Actuators & Jackshafting P-75 

Smoke Detectors Installation Instructions P-76 

Smoke Dampers 

S-3V-I 3V Blade P-77 

S-3V-II 3V Blade P-78 

S-AF-I Airfoil Blade P-79 

S-AF-II Airfoil Blade P-80 

S-RD-I True Round P-81 

S-RD-II True Round P-82 

M/S Micro Switch P-83 

RCB-1, 2, 3, 4 Remote Control Box P-84 


Actuators & Jackshafting P-86 

Dampers Enclosures & Transitions P-87 

Smoke Damper Operators P-88 

Motor/Actuators P-89 

Radiation Dampers 

C-RD & C-RD-A Ceiling Damper Round P-90 

C-RD-T & C-RD-A/T Ceiling Damper Square & Round P-91 

C-S/R & C-S/R-A Ceiling Damper Square & Rectangular P-92 

C-S/R-HC & C-S/R-HC-A Ceiling Damper Square & Rectangular P-93 

C/FS (B) (X) Ceiling Damper Square & Rectangular P-94 

C/FSR-1 & (-2) Ceiling Damper Square & Round P-95 

C/FS-2F Ceiling Damper Square & Rectangular P-96 

C/D-P Ceiling Damper Square & Rectangular P-97 

CK-2000-1 & (1B) Thermal Blanket P-98 

Applications P-99 


Wood-Framed Joist w/Gypsum Ceiling P-101 

Life Safety Inspection-Test & Maintenance P-102 

Agency Listings 


UL Certificate - Ceiling Radiation Damper P-103 

UL Certificate - Fire/Smoke Damper P-105 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12


Due to continuing research, MAT reserves the right to change specifications without notice. 

FD-SA 

Model FD-SA Curtain Fire Damper 

UL 555 Classified 1-1/2 and 3 hours for use in static systems 

6235 South Oak Park Avenue Chicago, IL 60638 USA Represented by: 

Toll free: 800.585.7686 +1.708.552.4040 

Fax: +1.708.594.0396 www.metairtech.com 

Application 

• The Model FD-SA is UL Classified for installation in walls, floors, and 

partitions with a fire rating of less than 3 hours. 

• This damper may be installed vertically or horizontally in static HVAC 

systems that automatically shut down in the event of fire. (See optional 

3 hr rating) 

Standard Construction 

• Frame: 12” Roll formed Frame - Galvanized Steel - Integral Sleeve 

• Blades: Low Profile Roll Formed - Galvanized Steel 

• Closure Springs (horizontal models only): Stainless Steel constant force 

coil 

• Fusible Link - UL-33: UL Classified 165°F (Standard), 212°F (Optional) 

• Dampers are furnished approximate to the duct dimensions provided, 

unless otherwise noted 

Model FD-SALB meets or complies with the following as a fire damper: 

• All major building codes, including IBC/ICC International Code 

• UL 555 Classified 1-1/2 and 3 Hour - File #R27198 

• NFPA - 90A, 80 

Sizes (duct) 1-1/2 Hour 

Min. V or H 6” X 6”, 152mm X 152mm 

*Max. Vertical 96”W X 96”H, 2438mm X 2438mm 

*Max. Horizontal 80”W X 40”H, 2032mmX 1016mm 

*May consist of multi-sections 

Sizes (duct) 3 Hour 



*Max. Horizontal 80”W X 40”H, 2032mm X 1016mm 


Options 

• Retaining Angles 

• One Side 

• Both Sides 

• 3 Hour Rating 

• Mounting 

• Horizontal 

• Vertical 

Note 

Refer to installation instructions for required opening in fire rated barrier. 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-1 Rev 7


Model FD-SB Curtain Fire Damper 


Application 

• The Model FD-SB is UL Classified for installation in walls, floors, and 


• May be installed vertically or horizontally in static HVAC systems that 

automatically shut down in the event of fire. (See optional 3 hr rating) 





coil 




Model FD-SB meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 











Options 


• One Side 



• Mounting 


• Vertical 


FD-SB 

Represented by: 6235 South Oak Park Avenue Chicago, IL 60638 USA 

Toll free: 800.585.7686 +1.708.552.4040 


P-2 Rev5 © 2012 Metropolitan Air Technology. All rights reserved. 7/12

FD-SB 


Model FD-SB Curtain Fire Damper Size Chart 

Horizontal and vertical 1-1/2 and 3 hour 


Toll free: 800.585.7686 +1.708.552.4040 


Xx 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-2b

Options 



• One Side 


• Taped & Sealed Transition for Medium Pressure 

System 

• Caulked & Sealed Damper Frame 

Note 

Refer to installation instructions for required 

opening in fire rated barrier. 



FD-SC 

Model FD-SC Curtain Fire Damper 


Application 

• The Model FD-SC is UL Classified for installation in walls, floors, and 


• This damper must be installed vertically or horizontally in static HVAC 


3 hr rating) 


• Frame: 12” Roll formed Type C Frame - Galvanized Steel - Integral 

Sleeve. See duct transition options on next page 

• Blades: Low Profile Roll Formed - Galvanized Steel 100% Free Area 

• Closure Springs (horizontal models only): Stainless Steel constant 

force coil 




• Dampers are furnished approximately 1/4” undersized to the duct 

dimensions provided, unless otherwise noted. 

Model FD-SC meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 

Sizes (duct) 1-1/2 & 3 Hour 

Rectangular or Oval 




Round 

Min. V or H 3”Diameter, 76mm 

*Max. Vertical 43” Diameter, 1092mm 

*Max. Horizontal 35” Diameter, 889mm 

*See Chart for Overall Sizes 


Toll free: 800.585.7686 +1.708.552.4040 


P-3 Rev 6 © 2012 Metropolitan Air Technology. All rights reserved. 7/12

Transitions for Type C Frames 

FD-SC 


Toll free: 800.585.7686 +1.708.552.4040 



Model FD-SC Curtain Fire Damper Size Chart 


© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-3b Rev 6



FDD-SA 

Model FDD-SA Curtain Fire Damper 

UL 555 Classified 1-1/2 and 3 hours for use in dynamic or static systems 

Application 

• The Model FDD-SA is UL Classified for installation in walls, floors, and 


• This damper may be installed vertically or horizontally in dynamic HVAC 

systems that continue to run in the event of fire. Also approved for 

static systems. (See optional 3 hour rating) 




• Closure Springs: Stainless Steel constant force coil 


• Maximum Velocity: 2000 FPM (10.2 M/S) 

• Maximum Pressure: 4” WG (1KPA) 



Model FDD-SA meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 



*Max. Vertical 72”W X 36”H, 1829mm X 914mm or 36”W X 72”H, 

914mm X 1829mm 

*Max Horizontal 36”W X 36”H, 914mm X 914mm 


Options 


• One Side 



• Mounting 


• Vertical 

Note 



Toll free: 800.585.7686 +1.708.552.4040 





FDD-SB 

Model FDD-SB Curtain Fire Damper 



Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The Model FDD-SB is UL Classified for installation in walls, floors, and 




static systems (See optional 3 hr rating) 












Model FDD-SB meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 






Options 


• One Side 



• Mounting 


• Vertical 

Note 





FDD-SB 

Model FDD-SB Curtain Fire Damper 



Toll free: 800.585.7686 +1.708.552.4040 


P-5b © 2012 Metropolitan Air Technology. All rights reserved. 7/12 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

21 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

33 

34 

35

opening = see table on P-6b 

Options 


• One Side 



• Mounting 


• Vertical 

• Low Profile Round 

Note 

Refer to installation instructions for required 

opening in fire rated barrier. 



FDD-SC 

Model FDD-SC Curtain Fire Damper 



Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The Model FDD-SC is UL Classified for installation in walls, floors, and 


• This damper must be installed vertically or horizontally in dynamic 

HVAC systems that continue to run in the event of fire. Also approved 

for Static Systems. (See optional 3 hr rating) 


• Frame: 12” Roll formed Type C Frame - Galvanized Steel - Integral 

Sleeve. See duct transition options on next page. 

• Blades: Low Profile Roll Formed - Galvanized Steel 100% Free Area 









Model FDD-SC meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 




*Max. Vertical 71”W X 32”H, 1803mmX 813mm 


Round 

Min. V or H 4”, 102mm 

*Max. Vertical 31”, 787mm 

*Max. Horizontal 20”, 508mm 

Round (low profile) 




*See Chart for Overall Sizes 


Transitions for Type C Dampers 



FDD-SC 

Model FDD-SC Curtain Fire Damper Size Chart 



Toll free: 800.585.7686 +1.708.552.4040 


P-6b Rev 8 © 2012 Metropolitan Air Technology. All rights reserved. 7/12

FD-A 


Toll free: 800.585.7686 +1.708.552.4040 



Model FD-A Curtain Fire Damper 


Application 

• The Model FD-A is UL Classified for installation in walls, floors, and 




3 hr rating) 


• Frame: Roll formed Frame - Galvanized Steel 



coil 




Model FD-A meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 




*Max. Horizontal 120”W X 40”H, 3048mm X 1016mm or 

96”W X 48”H, 2438mm X 1219mm 




*Max. Vertical or Horizontal 80”W X 40”H, 2032mm X 1016mm 


Options 

• Factory Sleeve (20 Ga min.) 


• One Side 



• Mounting 


• Vertical 



FD-B 


Model FD-B Curtain Fire Damper 


Application 

• The Model FD-B is UL Classified for installation in walls, floors, and 




3 hr rating) 


• Frame: Roll formed Frame - Galvanized - 22 Ga Standard 20 Ga Optional 

• Blades: Low Profile Roll Formed - Galvanized - 22 Ga Standard 20 Ga 

Optional 


coil 






Model FD-B meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 





96”W X 43”H, 2438mm X 1092mm 






Options 



• One Side 



• Mounting 


• Vertical 



Toll free: 800.585.7686 +1.708.552.4040 



FD-B 


Toll free: 800.585.7686 +1.708.552.4040 



Model FD-B Curtain Fire Damper Size Chart 



Options 



• One Side 



• Taped & Sealed Transition for Medium Pressure 

System 

• Caulked & Sealed Damper Frame/Sleeve 

• Mounting 


• Vertical 

FD-C 


Model FD-C Curtain Fire Damper 


See size chart dwg P-9b 

Application 

• The Model FD-C is UL Classified for installation in walls, floors, and 




3 hr rating) 




• Closure Springs (horizontal models only): Stainless Steel constant force coil 






Model FD-C meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 






95”W X 42”H, 2413mm X 1067mm 

Round 









Round 




*May consist of multi-sections. 



Toll free: 800.585.7686 +1.708.552.4040 


P-9 Rev 4x © 2012 Metropolitan Air Technology. All rights reserved. 7/12


FD-C 


Toll free: 800.585.7686 +1.708.552.4040 



Model FD-C Curtain Fire Damper Size Chart 


FD-Low Profile-LP 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-9b Page 2 of 2

Options 



• One Side 



• Mounting 


• Vertical 

FDD-B 


Model FDD-A Curtain Fire Damper 



Application 

• The Model FDD-A is UL Classified for installation in walls, floors, and 




static systems. (See optional 3 hr rating) 




• Closure Spring: Stainless Steel constant force coil 






Model FDD-A meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 



*Max. Vertical 72”W X 36”H, 1829mm X 914mm or 

36”W X 72”H, 914mm X 1829mm 




Toll free: 800.585.7686 +1.708.552.4040 



FDD-B 


Toll free: 800.585.7686 +1.708.552.4040 



Model FDD-B Curtain Fire Damper 


Application 

• The Model FDD-B is UL Classified for installation in walls, floors, and 


• This damper may be installed vertically or horizontally in HVAC systems 

that continue to run in the event of fire. Also approved for static 

systems. 

• (See optional 3 hr rating) 












Model FDD-B meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 






Options 



• One Side 



• Mounting 


• Vertical 





FDD-B 

Model FDD-B Curtain Fire Damper 


4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

324 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

21 

22 

24 

25 

26 

27 

28 

29 

30 

31 

32 

33 

34 

354 


Toll free: 800.585.7686 +1.708.552.4040 


P-11b © 2012 Metropolitan Air Technology. All rights reserved. 7/12 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

21 

22 

24 

26 

27 

28 

29 

30 

31 

32 

33 

34 

35 

36

FDD-C 

Duct Size - 1/4” 


Toll free: 800.585.7686 +1.708.552.4040 



Model FDD-C Curtain Fire Damper 



Application 

• The Model FDD-C is UL Classified for installation in walls, floors, and 
















Model FDD-C meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 


• Min. V or H - 5” X 3”, 127mm X 76mm 

• Max Vertical Size - *71”W X 32”H, 1803mm X 813mm 

• *Max Horizontal Size - *35”W X 32”H, 889mmX 813mm 


Options 



• One Side 



• Taped & Sealed Transition for Medium Pressure System 

• Caulked & Sealed Damper Frame/Sleeve 

• Mounting 


• Vertical 



FDD-C 


Model FDD-C Curtain Fire Damper Size Chart 

Dynamic closure models 1-1/2 and 3 hour 

FD-Low Profile-LP 


Toll free: 800.585.7686 +1.708.552.4040 




Toll free: 800.585.7686 +1.708.552.4040 



Model FD-ASL Slimline Curtain Fire Damper 


FD-ASL (Slimline) or FD-ASL-OW (Out of Wall Slimline) 

Application 

• The Model FD-ASL is UL Classified for installation in walls, floors, and 




3 hr rating) 


• Frame: Slimline Roll formed Frame - Galvanized Steel 



coil 






Model FD-ASL meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 




*Max. Horizontal 96”W X 48”H, 2438mm X 1219mm or 120”W 

X 40”H, 3048mm X 1016mm 



• Min. V or H - 4” X 4”, 102mm X 102mm 

• *Max Vertical or Horizontal Size - 80”W X 40”H, 2032mm X 1016mm 


Options 



• One Side 



• Mounting 


• Vertical 





FD-BSL (Slimline) 

Model FD-BSL Slimline Curtain Fire Damper 


Application 

• The Model FD-BSL is UL Classified for installation in walls, floors, and 




3 hr rating) 


• Frame: Slimline Roll formed Frame - Galvanized Steel 



coil 






Model FD-BSL meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 










Options 



• One Side 



• Mounting 


• Vertical 


Toll free: 800.585.7686 +1.708.552.4040 



FD-BSL 


Toll free: 800.585.7686 +1.708.552.4040 



Model FD-BSL Curtain Fire Damper Size Chart 



(38.1mm) 



FD-AUSL (Ultra Slimline) 

Model FD-AUSL Ultra Slimline Curtain Fire Damper 


Application 

• The Model FD-AUSL is UL Classified for installation in walls, and partitions 

with a fire rating of less than 3 hours. 

• This damper may be installed vertically in static HVAC systems that 

automatically shut down in the event of fire. (See optional 3 hr rating) 









Model FD-AUSL meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 



Max. Vertical 40”W X 40”H, 1016mm X 1016mm 

Options 



• One Side 




Toll free: 800.585.7686 +1.708.552.4040 



Nominal Size 

Less 1/4” (6mm) 

Xx 


Model FDD-ASL Slimline Curtain Fire Damper 



FDD-ASL (Slimline) or FDD-ASL-OW (Out of Wall Slimline) 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The Model FDD-ASL is UL Classified for installation in walls, floors, and 



systems that continue to operate in the event of fire. Also approved for 













Model FDD-ASL meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 






Options 



• One Side 



• Out of Wall Construction available vertical only 42”W X 48”H max size 

(consult factory for dwg.)(See Installation Instructions on P-36) 

• Mounting 


• Vertical 




FDD-BSL (Slimline) 

Model FDD-BSL Slimline Curtain Fire Damper 


Application 

• The Model FDD-BSL is UL Classified for installation in walls, floors, and 
















Model FDD-BSL meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 






Options 



• One Side 



• Mounting 


• Vertical 


Toll free: 800.585.7686 +1.708.552.4040 



FDD-BSL (Slimline) 


Toll free: 800.585.7686 +1.708.552.4040 



Model FDD-BSL Slimline Curtain Fire Damper Size 

Chart UL 555 Classified 1-1/2 and 3 hours for use in dynamic or static systems 


Options 



• One Side 



• Mounting 


• Vertical 

FD-ACMH 


Model FD-ACMH Caulk Sealed Curtain Fire Damper 

UL 555 Classified 1.5 & 3 hours for use in static systems (up to 10” static pressure) 

Application 

• The Model FD-ACMH is UL Classified for installation in walls, floors, 

and partitions with a fire rating of less than 3 hours. 

• This damper may be installed vertically or horizontally in static systems 

that shuts down in the event of fire. (See optional 3 hr rating) 

• These dampers are rated for duct pressure static leakage. Leakage 

through damper is not rated. Dampers are sealed with rated caulk and 

listed tape. 






• Sleeve: 5” (127mm) X 18 Ga Steel 





Model FD-ACMH meets or complies with the following as a fire damper: 


• UL 555 Classified 1-1/2 & 3 Hour - File #R27198 

• NFPA - 90A, 80 





*Max. Horizontal 

Round 

118”W X 35”H, 2997mm X 889mm 








*Max. Horizontal 

Round 

75”W X 35”H, 1905mm X 889mm 






Toll free: 800.585.7686 +1.708.552.4040 



FD-ACHP 


Model FD-ACHP (Welded Sleeve) Curtain Fire Damper 

UL 555 Classified 1.5 & 3 hours for use in static systems (up to 12” static pressure) 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The Model FD-ACHP is UL Classified for installation in walls, floors, and 


• This damper may be installed vertically or horizontally in static systems 

that shut down in the event of fire. (See optional 3 hr rating) 

• These dampers are rated for duct pressure static leakage. Leakage 

through damper is not rated. Dampers are sealed via fully welded 

sleeve and transition. 






• Sleeve: 5” (127mm) X 18 Ga Steel 



Model FD-ACHP meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 






Round 





Options 



• One Side 



• Mounting 


• Vertical 




FD-SAVG 

FD-SAVG 

Fire Damper must be in the plane 

of the wall after installation. If grille 

places damper out of the plane, then 

a OW must be ordered. 

Model FD-SAVG Curtain Fire Damper 

UL 555 Classified 1-1/2 and 3 hours for behind grille 

Round 

Optional 

Application 

• The Model FD-SAVG is UL Classified for installation in walls, and 


• This damper may be installed horizontally in static systems that shut 

down in the event of fire. (See optional 3 hr rating) 


• Frame: Roll formed Frame - Galvanized Steel - Sleeved 

• Sleeve: 20 Ga Galvanized - 12” Length (305mm) Standard 


• Flange: 3/4” 




Model FD-SAVG meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 


Rectangular 

Min. Vertical 4”W X 4”H, 102mm X 102mm 

Max. Vertical 48”W X 36”H, 1219mm X 914mm or 36”W X 48”H, 

914mm X 1219mm 

*Round 

Min. Vertical 4”, 102mm 

Max. Vertical 46”, 1168mm 

*Optional 

Options 



• One Side 


• Damper Setback location 

• 212°F (100°C) Fuse Link 


Toll free: 800.585.7686 +1.708.552.4040 





FD-SAHG 

Fire Damper must be in the plane of the floor / 

ceiling after installation. If grille places damper 

out of the plane, then a OW must be ordered. 

Model FD-SAHG Curtain Fire Damper 

UL 555 Classified 1-1/2 and 3 hours for behind grille 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The Model FD-SAHG is UL Classified for installation in floors, and 


• This damper may be installed horizontally in static systems that shut 

down in the event of fire. (See optional 3 hr rating) 



• Sleeve: 20 Ga Galvanized - 12” (305mm) Length Standard 







Model FD-SAHG meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 


Rectangular 


Max. Horizontal 36”W X 36”H, 914mm X 914mm or 36”W 

X 48”H, 914mm X 1219mm 

*Round 

• Min Vertical Size - 4”, 102mm 

• Max Horizontal Size - 34”, 834mm 

*Optional 

Options 



• One Side 




• 212°F (100°C) Fuse Link 




FDD-SAVG 

FDD-SAVG 

3 11/16 ” 

Fire Damper must be in the plane of the wall / 

partition after installation. If grille places damper 

out of the plane, then a OW must be ordered. 

Model FDD-SAVG Curtain Fire Damper 


Round 

Optional 

Application 

• The Model FDD-SAVG is UL Classified for installation in walls, and 


• This damper may be installed vertically in or dynamic HVAC systems 

that continue to operate in the event of fire. Also approved for static 

systems. (See optional 3 hr rating) 



• Sleeve: 20 Ga Galvanized - 12” (305mm) Length Standard 









Model FDD-SAVG meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 


Rectangular 



*Round 

Min. Vertical 4” Diameter, 102mm 

Max. Vertical 34” Diameter, 834mm 

*Optional 

Options 



• One Side 



• 212°F (100°C) Fuse Link 


Toll free: 800.585.7686 +1.708.552.4040 





FDD-SAHG 

Model FDD-SAHG Curtain Fire Damper 



Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The Model FDD-SAHG is UL Classified for installation in floors, and 


• This damper may be installed horizontally or vertically in dynamic HVAC 





• Sleeve: 20 Ga. Galvanized - 12” Length standard 









Model FDD-SAHG meets or complies with the following as a fire damper: 

• All major building codes, including IBC/ICC International Code UL 555 

Classified 1-1/2 & 3 Hour - File #R27198 

• NFPA - 90A, 80 


Rectangular 

Min. Horizontal 6”W X 6”H, 152mm X 152mm 

Max. Horizontal 36”W X 36”H, 914mm X 914mm 

*Round 

Min. Horizontal 4” Diameter, 102mm 

Max. Horizontal 34” Diameter, 834mm 

*Optional 

Options 



• One Side 



• 212°F (100°C) Fuse Link 

• Mounting 


• Vertical 


Grille or Register 

by others 

FD-AOW 

12” Std. 

(305mm) 

3/4” (19mm) 

standard 

4” Std. (102mm) 

set back 

6” Max. (152mm) 

16” Max . (406mm) 


Model FD-AOW Curtain Fire Damper 

UL 555 Classified 1-1/2 hour for use in static systems 

3-11/16” 

(94mm) 

Steel 

Sleeve 

Application 

• The Model FD-AOW is UL Classified for installation where the grille and 

damper assembly does not allow for mounting in the plane of the fire 

barrier with a fire rating of less than 3 hours. 

• This damper may be installed horizontally or vertically in static HVAC 

systems that shut down in the event of fire. 


• Frame: Roll formed Frame - Galvanized Steel Sleeved 

• Sleeve: 20 Ga. Galvanized - Wrapped in Thermal Blanket 





• Insulation: Typ. 3 sides vertical, 4 sides horizontal 


unless otherwise noted (not including thermal blanket). Wall opening 

must be oversized by 3/8” (9.5mm) to accommodate thermal blanket 

thickness. 

Model FD-AOW meets or complies with the following as a fire damper: 


• UL 555 Classified 1-1/2 Hour - File #R27198 


Min. Size 6”W X 6”H, 152mm X 152mm 

Max. Size *42”W X 48”H, 1067mm X 1219mm 


Options 



• One Side 

• Transitions on open (Non Grille) end 

• Mounting 


• Vertical 


Toll free: 800.585.7686 +1.708.552.4040 



Grille or Register 

by others 

FDD-AOW 


Model FDD-AOW Curtain Fire Damper 

UL 555 Classified 1 1/2 hours for use in dynamic systems 

3/4” (19mm) 

standard 

Insulation 

(typ. 3 sides) 

4” Std. (102mm) 

set back 

3-11/16” 

(94mm) 

6” Max. (152mm) 

16” Max . (406mm) 


Toll free: 800.585.7686 +1.708.552.4040 


Steel 

Sleeve 

Application 

• The Model FDD-AOW is UL Classified for installation where the grille 

and damper assembly does not allow for mounting in the plane of the 

fire barrier with a fire rating of less than 3 hours. 

• This damper may be installed horizontally or vertically in dynamic 

systems that continues to operate in the event of fire. 



• Sleeve: 20 Ga. Galvanized - Wrapped in Thermal Blanket 



• Closure Springs): Stainless Steel constant force coil 




• Insulation: Typ. 3 sides vertical, 4 sides horizontal 


unless otherwise noted (not including thermal blanket). Wall opening 

must be oversized by 3/8” (9.5mm) to accommodate thermal blanket 

thickness. 

Model FDD-AOW meets or complies with the following as a fire damper: 






Max. Horizontal 36”W X 36”H, 914mm X 914mm 


Options 



• One Side 

• Transitions on open (Non Grille) end 

• Mounting 


• Vertical 




FD-R (Static) or FDD-R (Dynamic) 

Model FD-R (Static) FDD-R (Dynamic) True Round Fire 

Damper UL 555 Classified 1-1/2 hours 

Application 

• The Model FD-R and FDD-R are UL Classified for installation in walls, 

floors, and partitions with a fire rating of less than 3 hours. 

• This damper may be installed horizontally or vertically in static systems 

(FD-R) that shut down in the event of fire or dynamic systems (FDD-R) 

that continue to operate in the event of fire. 


• Frame: Roll formed Frame - Galvanized Steel - Integral Sleeve 

• Blades: Double Thickness - Galvanized Steel - Welded 

• Axles: 3/8” (9.5mm) square plated steel 

• Jackshaft: 1/2” (12.7mm) diameter plated steel 

• Bearings: Bronze Oilite press-fit into frame 

• Spring: Stainless Steel 


• Manual Locking Quadrant - (may be required for inspection) 

• Retaining Plates: 2-20 ga. galvanized steel with angle clips (factory 

installed) 



• Dampers are furnished approximately 1/8” (3.2mm) smaller than given 

duct dimensions 

Model FD-R and FDD-R meets or complies with the following as a fire 

damper: 

• All major building codes, including IBC/ICC 

• International Code UL 555 Classified 1-1/2 Hour - File #R27198 

• NFPA - 90A, 80 


Min. Size 8”Diameter, 203mm 

Max. Size 24” Diameter, 610mm 

Options 

• Sleeve/Damper Body 20” (508mm) 

• Sleeve/Damper Body 24” (609mm) 

• Actuator 

• Mounting 


• Vertical 

Note 

The jackshaft permits operation by any standard locking quadrant, 

electric or pneumatic actuator. 


Toll free: 800.585.7686 +1.708.552.4040 



FD-R (Static) & FDD-R (Dynamic) 


Model FD-R & FDD-R Fire Damper 

UL 555 Classified vertical and horizontal - 1-1/2 hour 


Toll free: 800.585.7686 +1.708.552.4040 



(-CR) 

Options 




• Round Transitions (FD-110-3V Round) 

• Out of Wall Const. Available (See dwg. P-36 

inst.) 

• EFL (Electric Fusible Link)* 

• PFV (Pneumatic Fusible Valve)* 

• Multi-Section, EFL, OR PFV Options will require 

actuators to be installed on the damper. 

• 250° - 350° (Actuator Req.) 

• Mounting 


• Vertical 

*Option provides quick and economical way to check 

damper operations and also provide a Systematic 

Closure Control. Option PFV allow damper operation 

without the need/cost for an EP valve and electrical 

connection at the damper. 

W+ 


Model FD-110-3V Multi-Blade Fire Damper 



FD-110-3V, FD-110-3V-OW (Out of Wall), FD-110-3V-CR (Round) 

H+ 

Application 

• The Model FD-110-3V is UL Classified for installation in walls, floors, 



that shut down in the event of fire. (See optional 3 hr rating) 


• Frame: 5” Roll formed Frame - Galvanized Steel hat-section w/staked 

corners & integral bracing 

• Blades: 16 Ga. Roll formed - Galvanized Steel 

• min. width: 4-1/4” (108mm) 

• max. width: 7-1/4” (184mm) 

• Axles: square plated steel 

• Linkage: Concealed in frame. Linkage bars are 1/8” (3.2mm) 


• Closure Spring: Stainless Steel 



• Non-sleeved (with side plate) dampers are furnished approxmately 1/4” 

(6.4mm) smaller than given duct dimensions. Sleeved dampers are 

furnished approximately the same size as given duct dimension, unless 

otherwise noted 

Model FD-110-3V meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 










Toll free: 800.585.7686 +1.708.552.4040 



FD-110-3V 


Model FD-110-3V Multi-Blade Static Fire Damper 

UL 555 Classified vertical and horizontal - 1-1/2 & 3 hours 


Toll free: 800.585.7686 +1.708.552.4040 



(-CR) 

Options 




• Round Transitions (FD-160-AF Round) 


inst.) 



• 250° - 350° (Actuator Req.) 

• Mounting 


• Vertical 







Model FD-160-AF Multi-Blade Curtain Fire Damper 


* D = Duct Size Minus 1/4” 

*16”-20 Ga. sleeve required 

for FD-160-AF-CR (Round) 

Max. 46” diameter 


FD-160-AF, FD-160-AF-OW (Out of Wall), FD-160-AF-CR (Round) 

Application 

• The Model FD-160-AF is UL Classified for installation in walls, floors, 


• This damper may be installed horizontally or vertically in static HVAC 

systems that shut down in the event of fire. 




• Blades: Airfoil-shaped roll-formed- Double Skin Galvanized Steel 

• min. width: 5” (127mm) 

• max. width: 7” (178mm) 







• Maximum Velocity: 2000 fpm (10.2 m/s) on all sizes 

• Maximum Pressure: 4” wg (1kPa). Consult Factory For Velocities up to 

4000 FPM and 6.0” w.g. 

• Non-sleeved (with side plate) dampers are furnished approximately 1/4” 



otherwise noted. 

Model FD-160-AF meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 











Toll free: 800.585.7686 +1.708.552.4040 



FD-160-AF 


Model FD-160-AF Multi-Blade Static Fire Damper 

UL 555 Classified low pressure drop airfoil blade - AMCA standard 500-D 1-1/2 & 3 hours 


Toll free: 800.585.7686 +1.708.552.4040 



(-CR) 

Options 




• Round Transitions (FD-110-3V Round) 


inst.) 



• Multi-Section, EFL, OR PFV Options will require 

actuators to be installed on the damper. 

• 250° - 350° (Actuator Req.) 

• Mounting 


• Vertical 






W+ 


Model FDD-110-3V Multi-Blade Fire Damper 



FDD-110-3V, FDD-110-3V-OW (Out of Wall), FDD-110-3V-CR (Round) 

H+ 

Application 

• The Model FDD-110-3V is UL Classified for installation in walls, floors, 




static systems. 




• Blades: 16 Ga. Roll formed - Galvanized Steel 

• min. width: 4-1/4” (108mm) 

• max. width: 7-1/4” (184mm) 









• Non-sleeved (with side plate) dampers are furnished approximately 1/4” 




Model FDD-110-3V meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 










Toll free: 800.585.7686 +1.708.552.4040 



FDD-110-3V 


Model FDD-110-3V Multi-Blade Dynamic Fire Damper 

UL 555 Classified Vertical And Horizontal - 1-1/2 & 3 Hours 


Toll free: 800.585.7686 +1.708.552.4040 



(-CR) 

Options 




• Round Transitions (FD-160-AF Round) 


inst.) 



• 250° - 350° (Actuator Req.) 

• Mounting 


• Vertical 







Model FDD-160-AF Low Pressure Drop Fire Damper 

UL 555 Classified 1.5 & 3 hours for use in dynamic or static systems 

* D = Duct Size Minus 1/4” 

*16”-20 Ga. sleeve 

required for FDD-160-AF 

(Round) Max. 46” diameter 


FDD-160-AF, FDD-160-AF-OW (Out of Wall), FDD-160-AF-CR (Round) 

Application 

• The Model FDD-160-AF is UL Classified for installation in walls, floors, 




static systems. (See optional 3 hour rating) 


• Frame: Roll formed Frame - Galvanized Steel hat-section w/staked 


• Blades: Airfoil-shaped roll-formed- Double Skin Galvanized Steel 

• min. width: 5” (127mm) 

• max. width: 7” (178mm) 








• Maximum Pressure: 4” wg (1kPa). Consult Factory For Velocities up to 

4000 FPM and 6.0” w.g. 

• Non-sleeved (with side plate) dampers are furnished approximately 

1/4” (6.4mm) smaller than given duct dimensions. Sleeved dampers are 



Model FDD-160-AF meets or complies with the following as a fire 

damper: 



• NFPA - 90A, 80 











Toll free: 800.585.7686 +1.708.552.4040 



FDD-160-AF 


Model FDD-160-AF Low Pressure Drop Fire Damper 

Low pressure airfoil blade UL 555 Classified 1-1/2 & 3 hours per AMCA 500-D for use 

in dynamic or static systems 


Toll free: 800.585.7686 +1.708.552.4040 


© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-31b Rev9



FD-A-3V 

Model FD-A-3V Single Blade Fire Damper 

UL 555 Classified 1-1/2 hours for use in static systems 

Application 

• The Model FD-A-3V is UL Classified for installation in walls, floors, and 



that shut down in the event of fire. 


• Frame: Roll formed Frame - Galvanized Steel - Integral Sleeve 

• Blades: 16 Ga. Galvanized Steel 

• Axles: 3/8” square plated steel 

• Linkage: Jackshaft to blade 




• Dampers are furnished approximately 1/8” (3.2mm) smaller than given 


Model FD-A-3V meets or complies with the following as a fire damper: 



• NFPA - 90A, 80 

Sizes (duct) 1-1/2 Hour & 3 Hour 


Max. Size 16”W X 16”H, 406mm X 406mm 

Options 


• One Side 

• Two Sides 

• Mounting 


• Vertical 


Toll free: 800.585.7686 +1.708.552.4040 





MS 

Model FD Fire Damper with Model MS (microswitch) 

UL 555 Classified 1.5 & 3 hours for status control or fan shut off 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The Model MS, Microswitch, is UL Classified to be installed on any 

Metropolitan Air Technology Fire Dampers 1-1/2 or 3 Hour Rated. 

• The Microswitch Package is used to remotely indicate if the damper 

is open or closed and can be wired through a relay to control fan 

operation. 



• Blades: 16 Ga. Galvanized Steel 


Model MS meets or complies with the following as a fire damper: 


• UL 555 Classified - File #R27198 

• NFPA - 90A, 80 

Sizes (duct) 1-1/2 Hour & 3 Hour 


Max. Size 48”W X 48”H, 1219mm X 1219mm 

Options 

• Narrow 2-3/16” (56mm) or 1-1/2” (38.4mm) frame 

• Electro Thermal Links 

• Adjustable Blade Stack for Combination 

• Solenoid Release 

• Mounting 


• Vertical 




ANG 

Model ANG Framed Retaining Angles 

For UL fire damper installations 

Application 

• The Model ANG Framed Retaining Angles may be used instead of the 

normal mounting angles being used at present. 

• The model ANG retaining angles can be installed on MAT curtain fire 

dampers, multi-blade fire dampers and combination fire/smoke 

dampers with 1-1/2 hr. or 3 hr. vertical or horizontal fire ratings. 

• ANG angles can be factory supplied two per damper, depending on 

order and installation. 


• 16 Ga. 1-1/2” x 1-1/2” (38mm x 38mm) Galvanized Steel 

• Formed Galvanized Steel with riveted corners. 

Sizes: Maximum and minimum sizes correspond to the individual damper 

model. Check the appropriate submittal sheet or size chart. 

Installation 

1. Install damper within fire separation as detailed in the appropriate 

damper installation instruction sheet. Omit the normal perimeter 

angles. 

2. Place the model ANG angle around the damper sleeve on both sides of 

the fire separation as shown below. 

3. The ANG angles must be attached to the sleeve with No. 10 sheet 

metal screws, tack or spot welds, 1/4” (6.4mm) bolts and nuts, or 3/16” 

(4.8mm) steel pop rivets. 

The fasteners must be spaced 6” (152.4mm) on centers and be a 

maximum of 2” (50.8mm) from the corners. 

A minimum of two fasteners are required on each top, bottom or side of 

the damper sleeve. 


Toll free: 800.585.7686 +1.708.552.4040 



General Notes 

This installation instruction applies to Fire Dampers (static, dynamic, 

curtain, single and multi-blade types) mounted in the plane of an 

UL approved fire partition. The dampers are designed for operation 

in the vertical or horizontal position with blades running horizontal. 

The dampers shall not be compressed or stretched into the opening. 

Transportation and installation of the dampers shall be handled with 

the sleeve or frame. Do not lift the damper with the blades or actuator. 

Special care shall be given to the damper before installation and 

after to insure it is protected against dirt weather, mortar and drywall 

dust, wall texture and paint. Any of these conditions could cause the 

damper not to operate correctly and void the warranty. Suitable access 

to inside duct is to be provided for inspection and replacement 

of parts such as heat response devices and actuators per NFPA 90A 

and local authority having jurisdiction. As with all joints, contractor 

must seal duct collar connections in the field after installation. MAT 

Model numbers which are UL approved to utilize this installation are 

FD Series and FDD Series In Partition Mounted Curtain and Multi- 

Blade Fire Dampers. 

1. Opening Preparation/Clearances: 

The fire barrier opening shall be larger than the damper to allow for 

thermal expansion and ease of installation. When steel stud/gypsum 

or wood stud/gypsum partitions are being used then refer to Fig. 1-3 

for additional information and details. 

A. Dampers Assemblies Using 2 Angles Methods (see note 4a) 

shall be a minimum of 1/8” (3mm) per linear foot (305mm) of height 

and width of sleeved assembly up to a maximum of 1-1/2”(38mm) 

and a minimum of 1/4” (6mm). For Static Systems the maximum 

single section curtain damper is 60” x 60” (1524mm x 1524mm) 

vertical and 40” x 40” (1016mm x 1016mm) or 48” x 48” (1219mm x 

1219mm) in horizontal mountings, based on type “A” dampers. The 

maximum single section multi-blade damper is 36” x 48” (914mm x 

1219mm) in vertical or horizontal mountings For Dynamic Systems 

the maximum single section curtain damper is 36” x 36” (914mm x 

914mm) in vertical mountings and 24” x 24” (610mm x 610mm) in 

horizontal mountings, based on type “A” dampers. The maximum 

single section multi-blade damper is 36” x 48” (914mm x 1219mm) in 

vertical or horizontal mountings. This method is acceptable for 1-1/2 

and 3 hour fire dampers. See Underwriter’s Laboratories Listings for 

maximum multiple assembly sizes. 

B. Dampers Assemblies Using 1 Angle Methods (see note 4b) shall 

be minimum of 1/8” (3mm) per linear foot (305mm) of height and 


Fire Dampers Installation Instructions 

(Static and Dynamic) 

Thermal 

Gap 

width of sleeved assembly up to a maximum of 1-1/2” (38mm) and a 

minimum of 1/4” (6mm). The maximum single section is the same as 

in A above. The maximum multi-section is 108”w or 108”h up to 36 

square feet. This method is acceptable for 1-1/2 hour fire dampers 

mounted in a masonry/concrete or steel stud/gypsum wall only. 

C. Dampers Assemblies Using No Angles Methods (see note 4c) 

shall be a minimum of 1/4” (6mm) and a maximum of 1/2” (13mm) 

The maximum single section is the same as in A above. The maximum 

multi-section is 42”w x 48”h. This method is acceptable for 

1-1/2 hour fire dampers mounted in a masonry/concrete or steel stud/ 

gypsum wall only. 

2. Sleeves shall be of the SAME GAGE or heavier as the duct to 

which it is attached, if one of the breakaway connection is used as 

defined in the SMACNA Fire, Smoke and Radiation Damper Guide 

for HVAC Systems (Fig. 4-6) and in NFPA 90A. Gages shall conform 

to SMACNA or ASRAE duct standards. Sleeves shall not extend 

beyond the fire barrier more than 6” (152mm) unless an actuator or 

factory installed access door is supplied, then the sleeve may extend 

up to 16” (406mm). Sleeve shall terminate at both sides of wall within 

dimensions shown. If a rigid connection is used, then the sleeve shall 

be minimum of 16 gage for dampers up to 36” (914mm) wide by 24” 

(610mm) high and 14 gage for dampers exceeding 36” (914mm) wide 

by 24” (610mm) high. 

Round and oval breakaway connections must use either a 4” 

(102mm) wide draw band or #10 (M5) sheet metal screws spaced 

equally around the circumference of the duct as follows: 3 screws for 

duct sizes 22” (559mm) and smaller; 5 screws for duct sized greater 

than 22” (559mm) and up to and including 36” (914mm): 8 screws for 

duct sizes greater than 36” (914mm). Refer to SMACNA Fire, Smoke 

and Radiation Damper Guide for HVAC Systems for information on 

Ductmate, Nexus, Ward, TDC and TDF systems and any additional 

information (Fig. 5-6). A sleeve may not be required if the damper 

frame is of sufficient size and shape so the mounting angles can be 

directly fastened to it. 

3. Multi-Section and “Damper to Sleeve” Connections: 

Damper shall be secured to the sleeve and to each other (when joined 

to make multiple damper assemblies) with #10 sheet metal screws, 

1/4” (6mm) nut and bolts, 1/4” (6mm) tack welds, 3/16” (5mm) steel 

rivets, or clinching (toggle) on 6” (152mm) centers. 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-35 Rev 9 Page 1 of 4 

Thermal 

Gap

4. Methods of Securing Damper in Opening: 

A. Two Angle (Two Sided) Method: 

This method is the oldest and commonly used. This method is approved 

for use in UL approved concrete/masonry partitions, steel 

stud/gypsum walls, and wood stud/gypsum walls. In this method 2 

sets of angles are used to secure the damper in the opening, one on 

each side of the partition (See Fig. 7). Two Angle Method is approved 

for 1-1/2 and 3 hour dampers, vertical or horizontal orientation, and 

any maximum size multi-section UL approved damper (see Underwriter’s 

Laboratories Listings for maximum assembly sizes). Angles 

shall be a minimum of 1-1/2” X 1-1/2” (37mmx37mm) x 16 gauge. Angles 

are to be fastened to the sleeve on 6” centers with #10 (M5)sheet 

metal screws, 3/16” (5mm) steel pop rivets,1/2” (13mm) tack welds, 

or 1/4” (6mm) diameter nut and bolts with not more than 2” (51mm) 

from each end with a minimum of two connections per side/leg. The 

angles are to overlap the partition a minimum of 1” (25mm). These 

angles may be of a unit type construction and may or may not be 

fastened to each other at the corners. When the duct work terminates 

at the damper or installation prohibits angles from turning out/away 

from the wall, the retaining angle shall be reversed (leg turned into the 

opening) providing the size of the opening is increased by an amount 

equal to twice the combined thickness of the angle and the height of 

the screw or bolthead to maintain expansion clearances. See note 

1A for information on clearances. See Fig. 7 for detailed drawings of 

installations. 

B. One Angle (Single Sided) Method: In this method 1 set of 

angles are used to secure the damper in the opening. This method 

is approved for use in UL approved concrete/masonry partitions and 

steel stud/gypsum walls. Only one side of the fire partition will have 

the angles installed (see Fig. 8). One Angle Method is approved for 

1-1/2 hour dampers only, vertical and horizontal (angles on top side 

only) orientations, and the maximum size shall be 108” wide or 108” 

high up to 36 square feet and up to the maximum multi-section UL 

approved damper size (see Underwriter’s Laboratories Listings for 

maximum assembly sizes). Angle shall be a minimum of 1-1/2” x 

1-1/2” (37mm x 37mm) by 16 gauge. Angles are to be fastened to the 

sleeve on 6” centers with #10 (M5) sheet metal screws, 3/16” (5mm) 

steel pop rivets, 1/2” (13mm) tack welds, or 1/4” (6mm) diameter 

nut and bolts with not more than 2” (51mm) from each end with a 

minimum of two connections on each side/leg top and bottom. The 

angles are also to be fastened to the fire partition with: in concrete/ 

masonry partitions with #10 (M5) self-tapping concrete anchors or 

concrete screws on 6” (152mm) centers and must engage the fire 

partition a minimum of 1-1/2” (38mm); in steel stud/gypsum partitions 

secure the angles to the partition with #10 (M5) screws long 


Fire Dampers Installation Instructions continued 


enough to penetrate the J-Runners and E-Stud by a minimum of 3/8” 

(10mm). Use a minimum of two fasteners per side. The angles are to 

overlap the partition a minimum of 1” (25mm). These angles may be 

of a unit type construction and may or may not be fastened to each 

other at the corners. When the duct work terminates at the damper or 

installation prohibits angles from turning out/away from the wall, the 

retaining angle shall be reversed (leg turned into the opening) providing 

the size of the opening is increased by an amount equal to twice 

the combined thickness of the angle and the height of the screw or 

bolt head to maintain expansion clearances. Angles can be placed in 

front of or behind the drywall attaching directly to the steel studs or 

masonry. MAT’s Frame Retaining Angles (ANG) can be used in place 

of the angle mentioned above. See note 1B for information on clearances. 

See Fig. 8 for detailed drawings of installations. 

C . No Angle Method: In this method No angles are used to secure 

the damper in the opening. This method is approved for use in UL 

approved concrete/masonry partitions and steel stud/gypsum walls. 

This method uses a minimum 3/4” (19mm) flange on one end of the 

sleeve. The damper/sleeve assembly is placed in the opening so that 

the flange rest flush up to the partition, then the fasteners are placed 

through the sleeve into the partition (see Fig. 9). No Angle Method is 

approved for 1-1/2 hour dampers only, vertical and horizontal (flange 

on top side only) orientations, and the maximum size shall be 42” 

(1067mm) wide by 48” (1219mm) high up to the maximum multisection 

UL approved damper size (see Underwriter’s Laboratories 

Listings for maximum assembly sizes). The sleeve flange shall be a 

minimum of 3/4” (19mm) high by 20 gauge steel. If a flange/angle 

is added, it shall be a minimum of 1” x 1” (25mm x 25mm) by 18 

gauge steel and fastened with #10 (M5) bolts or screws, 1/2” (13mm) 

welds, or 3/16” (5mm) rivets to the sleeve, at a maximum spacing 

of 6” (152mm) o.c., not more than 2” (51mm) from each end with a 

minimum of two fasteners per side. The sleeve is to be fastened to 

the fire partition with: in concrete/masonry partitions with #10 selftapping 

concrete anchors or concrete screws on 6” (152mm) centers 

and must engage the fire partition a minimum of 1-1/2” (38mm); in 

steel stud/gypsum partitions secure the angles to the partition with 

#10 (M5) screws long enough to penetrate the J-Runners and E-Stud 

by a minimum of 3/8” (10mm). Use a minimum of two fasteners per 

side. The sleeve flange can be placed in front of or behind the drywall 

attaching directly to the steel studs or masonry. Be sure to not stretch 

the damper when securing it into the partition. Stretching the damper 

can cause it to bind up and prevent it from operating properly. MAT’s 

Frame Retaining Angles (ANG) can be used in place of the angle 

mentioned above. See note 1C for information on clearances. See 

Fig. 9 for detailed drawings of installations. 

P-35b Page 2 of 4 © 2012 Metropolitan Air Technology. All rights reserved. 7/12

Breakaway Connections 


Toll free: 800.585.7686 +1.708.552.4040 





Traditional Breakaway Style Transverse Joints Transverse Joints 

Illustrated at right have always been approved as breakaway connections. 

SMACNA testing has also approved the following variations as 

breakaway connections. 

• Standing “S” joints can be applied with no. 10 sheet metal screws 

(through joint and duct) subject to the following limitations: 

Maximum 2 screws in each side and in bottom joint. 

• Transverse joints illustrated can be applied as top and bottom 

joints with Drive Slip - side joints in duct heights up to 20 inches. 

(508 mm) 

Round and Oval Duct Breakaway Connections 

Round or flat oval ducts connected to Type R, CR or CO damper 

collars may use no. 10 sheet metal screws as follows: 

• Ducts to 22” (558 mm) wide (or dia.) and smaller may use 3 screws. 

• Ducts larger than 22” (558 mm) wide (or dia.) and up to 36” (914 

mm) dia. may use 5 screws. 

• Ducts larger than 36” (914 mm) wide (or dia.) may use 8 screws. 

NOTE: All breakaway connections described may have duct sealant 

applied in accordance with SMACNA recommendations. 

Manufactured Flanged System Breakway Connections 

Flanged connection systems manufactured by Ductmate, Ward, and 

Nexus are approved as breakaway connections when installed as 

illustrated. 

Proprietary Flange System Breakaway Connections 

TDC and TDF systems are approved as breakaway connections when 

installed as described in the TDC or TDF addendum to the SMACNA 

Duct Construction Standards except the corners may not be bolted. 

Standard 6” (152 mm) metal clip maybe used with spacing as shown 

in diagram. 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-35c Page 3 of 4




Manufacturer’s Recommendations 

All moving parts of the damper must be inspected and cycled at 

intervals not greater than every 12 months or in accordance with the 

latest edition of NFPA 90A, 92A, local codes and the actuator manufacturer. 

In addition, fuse links shall be removed and inspected for 

corrosion. Dry lubricants are recommended. 


Toll free: 800.585.7686 +1.708.552.4040 


P-35d Page 4 of 4 © 2012 Metropolitan Air Technology. All rights reserved. 7/12

Important General Notes: 

This installation instruction applies to Fire Dampers and Combination 

Fire/Smoke Dampers mounted outside the plane of an UL approved 

fire partition. Combination Fire/Smoke Dampers are approved for 

use in Static or Dynamic Systems. The dampers are designed for 

operation in the vertical or horizontal position with blades running 

horizontal. Dampers mounted horizontally in similar manor as vertical 

shown. The dampers are to be installed square and free from twisting 

or racking. The dampers shall not be compressed or stretched into 

the opening. Transportation and installation of the dampers shall 

be handled with the sleeve or frame. Do not lift the damper with the 

blades or actuator. Special care shall be given to the damper before 

installation and after to insure it is protected against dirt, weather, 

mortar and drywall dust, wall texture and paint. Any of these conditions 

could cause the damper not to operate correctly and void 

the warranty. Suitable access to inside duct is to be provided for 

inspection and replacement of parts such as heat response devices 

and actuators per NFPA 90A and local authority having jurisdiction. 

The need to seal the damper in the penetration is not required 

by Underwriters Laboratories. MAT dampers have been tested and 

approved to be mounted without the use of sealants around the 

perimeter space between the damper and the penetration. As with all 

joints, contractor must seal duct-collar connections in the field after 

installation. These dampers must be ordered as an assembly from the 

factory with the proper MAT insulation applied to the dampers. MAT 

Model numbers which are UL approved to utilize this installation are 

FD-OW, FDD-OW, F/S-3V-OW-I, F/S-3V-OW-II, F/S-AF-OW-I, 

F/S-AF-OW-II, F/S-3V-FA-I, F/S-3V-FA-II, F/S-AF-FA-I, F/S-AF-FA-II, 

FD-ASL-OW, FDD-ASL-OW, FD-110-3V-OW, FD-160-AF-OW, 

FDD-110-3V-OW, FDD-160-AF-OW. 




Fire & Combination Fire/Smoke Damper 

Installation Instructions (Out Of Wall/Partition) 


Toll free: 800.585.7686 +1.708.552.4040 


thermal expansion and ease of installation. When a steel stud/gypsum 

partition is being used then refer to Figs. 1 and 2 for additional 

information and details. The opening shall be a minimum of 1/4” 

(6mm) and a maximum of 1/2” (13mm). The maximum multi-section is 

42”w x 48”h. This method is acceptable for 1-1/2 hour fire dampers 

mounted in a masonry/concrete or steel stud/gypsum partitions only. 

2. Damper Sleeves and Breakaway Connections: 

Sleeves shall be of the SAME GAUGE or heavier as the duct to which 

it is attached, if one of the breakaway connection is used as defined 

in the SMACNA Fire, Smoke and Radiation Damper Guide for HVAC 

Systems (Figs. 3, 4, and 5) and in NFPA 90A. Gauges shall conform 

to SMACNA or ASHRAE duct standards. Sleeves shall not extend 





be a minimum of 16 gage for dampers up to 36” (914mm) wide by 

24” (610mm) high and 14 gage for dampers exceeding 36” (914mm) 

wide by 24” (610mm) high. Round and oval breakaway connections 

must use either a 4” (102mm) wide draw band or #10 (M5) sheet 

metal screws spaced equally around the circumference of the duct as 

follows: 3 screws for duct sizes 22” (559mm) and smaller; 5 screws 

for duct sizes greater than 22” (559mm) and up to and including 36” 

(914mm): 8 screws for duct sizes greater than 36” (914mm). Refer 

to SMACNA Fire, Smoke and Radiation Damper Guide for HVAC 

Systems for information on Ductmate, Nexus, Ward, TDC and TDF 

systems and any additional information (Figs. 4 and 5). A sleeve may 

not be required if the damper frame is of sufficient size and shape so 

the mounting angles can be directly fastened to it. 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-36a Rev 8


A. Grille Mount Method: In this method No angles are used to 

secure the damper in the opening. This method is approved for use 

in UL approved concrete/masonry partitions and steel stud/gypsum 

walls. This method uses a minimum 3/4” (19mm) flange on one end 

of the sleeve. The damper/sleeve assembly is placed in the opening 

so that the flange rest flush up to the partition, then the fasteners 

are placed through the sleeve into the partition (see Fig. 6). No 

Angle Method is approved for 1-1/2 hour dampers only, vertical and 

horizontal (flange on top side only) orientations, and the maximum 

size shall be 42” (1067mm) wide by 48” (1219mm) high up to the 

maximum multi-section UL approved damper size (see Underwriter’s 

Laboratories Listings for maximum assembly sizes). The sleeve flange 

shall be a minimum of 3/4” (19mm) high by 20 gauge steel. If a flange/ 

angle is added, it shall be a minimum of 1” x 1” (25mm x25mm) by 18 


welds, or 3/16” (5mm) rivets to the sleeve, at a maximum spacing of 

6” (152mm) o.c., not more than 2” (51mm) from each end with a minimum 

of two fasteners per side. The sleeve is to be fastened to the fire 

partition with: in concrete/ masonry partitions with #10 self-tapping 

concrete anchors or concrete screws on 6” (152mm) centers and 

must engage the fire partition a minimum of 1-1/2” 38mm); in steel 

stud/gypsum partitions secure the angles to the partition with #10 

(M5) screws long enough to penetrate the J-Runners and E-Stud by a 

minimum of 3/8” (10mm). Use a minimum of two fasteners per side. 

The sleeve flange can be placed in front of or behind the drywall attaching 

directly to the steel studs or masonry. Be sure to not stretch 




mentioned above. See note 1 for information on clearances. See Fig. 

6 for detailed drawings of installations. 

B. Continuous Duct Method: In this method 1 set of angles are 

used to secure the damper in the opening. This method is approved 

for use in UL approved concrete/masonry partitions and steel stud/ 

gypsum walls. Only one side of the fire partition will have the angles 


Fire & Combination Fire/Smoke Damper continued 


installed (see Fig. 7). One Angle Method is approved for 1-1/2 hour 

dampers only, vertical and horizontal (angles on top side only) orientations, 

and the maximum size shall be 42” wide x 48” high and up to 

the maximum multi-section UL approved damper size (see Underwriter’s 

Laboratories Listings for maximum assembly sizes). Angle 

shall be a minimum of 1-1/2” x 1-1/2” (37mmx37mm) by 16 gauge. 

Angles are to be fastened to the sleeve on 6” centers with #10 (M5) 

sheet metal screws, 3/16” (5mm) steel pop rivets, 1/2” (13mm) tackwelds, 

or 1/4” (6mm) diameter nut and bolts with not more than 2” 

(51mm) from each end with a minimum of two connections on each 

side/leg top and bottom. The angles are also to be fastened to the 

fire partition with: in concrete/masonry partitions with #10 (M5) selftapping 






side. The angles are to overlap the partition a minimum of 1” (25mm). 

These angles may be of a unit type construction and may or may not 

be fastened to each other at the corners. When the duct work terminates 

at the damper or installation prohibits angles from turning out 

away from the wall, the retaining angle shall be reversed (leg turned 

into the opening) providing the size of the opening is increased by an 

amount equal to twice the combined thickness of the angle and the 

height of the screw or bolt head to maintain expansion clearances. 

Angles can be placed in front of or behind the drywall attaching 

directly to the steel studs or masonry. MAT’s Frame Retaining Angles 

(ANG) can be used in place of the angle mentioned above. See note 

1 for information on clearances. See Fig. 7 for detailed drawings of 

installations. 4. Actuator Connections (if applicable): Electrical and/ 

or pneumatic connections to damper actuators (if provided) should 

be made in accordance with wiring and piping diagrams developed 

in compliance with applicable codes, ordinances and regulations. Be 

sure to check actuator for proper voltage and current draw. Tampering 

with the actuator’s installation or connecting the actuator to an 

improper voltage and current may void the warranty. 



Traditional Breakaway Style Transverse Joints Transverse Joints 

Illustrated at right have always been approved as breakaway connections. 



• Standing “S” joints can be applied with no. 10 sheet metal screws 

(through joint and duct) subject to the following limitations: 

Maximum 2 screws in each side and in bottom joint. 



(508 mm) 


Round or flat oval ducts connected to Type SR, CR or OV damper 

collars may use no. 10 sheet metal screws as follows: 

• Ducts to 22” (558 mm) wide (or dia.) and smaller shall use 3 

screws. 


mm) dia. shall use 5 screws. 

• Ducts larger than 36” (914 mm) wide (or dia.) shall use 8 screws. 

Note: All Breakaway Connections described may have duct sealant 

applied in accordance with SMACNA recommendations. 


Flanged connection systems manufactured by Ductmate, Ward, and 

Nexus are approved as breakaway connections when installed as 

illustrated. 






in diagram. 





Toll free: 800.585.7686 +1.708.552.4040 







Toll free: 800.585.7686 +1.708.552.4040 



1. 18 gauge galvanized steel integral sleeve shall be of the SAME 

GAUGE or heavier as the duct to which it is attached. Gauges shall 

conform to SMACNA or ASHRAE duct standards. The length of the 

sleeve extending beyond the wall opening shall not exceed 16” (406 

mm) on the operator side or 6” (152 mm) on the opposite side. 

2. The connecting duct shall terminate at the integral sleeve and is 

connected by using either: 

• A. a minimum of 3 - #10 sheet metal screws spaced equidistant 

around the sleeve for 22” and smaller duct. 

• B. a minimum of 5 - #10 sheet metal screws spaced equidistant 

around the sleeve for greater than 22” duct. 

• C. a 4” (101mm) drawband. 

3. Clearance between the damper sleeve and the round or square 

wall opening shall be a minimum of 1/2” (13 mm) and a maximum of 

1” (25 mm). 

4. Damper will be factory supplied with one retaining plate secured to 

the damper sleeve on the operator side of the damper. 

5. A minimum of 4 equally spaced 20 gauge galvanized steel clip 

angles shall be attached to both the integral sleeve and the retaining 

Option 1: Angles 2 Sides 

Option 1: UL approved 

wall or floor design 


Toll free: 800.585.7686 +1.708.552.4040 




Installation Instructions 

Typical wood, metal stud or masonry opening. 

(Refer to metal or wood stud framing 

for fire dampers in drywall partitions.) 

plate. The clip angles shall be attached with 1/8” (3.2mm) rivets, #10 

x 1/2” (12.7mm) sheet metal screws, bolts or welds. In metal stud/ 

gypsum applications, the retaining plate may be in front of or behind 

the gypsum, directly against the metal studs. 

6. Option 1: The damper may be installed in a wood/gypsum, steel 

stud/gypsum, or masonry fire partition in the vertical or horizontal 

position (blade shaft running horizontal) with a retaining plate flush 

against each side of the fire partition. Installation: with the factory installed 

retaining plate flush to the fire partition, place another retaining 

plate on the opposite side of the damper sleeve and slide it forward 

until it becomes flush with the opposite side of the partition. Place the 

Splice Clip over the cut portion of the retaining plate. Secure it with 

4 - #10 sheet metal screws or rivets. Secure the clip angles to the 

retaining plate and damper sleeve as illustrated. 

Important 

• Do Not Cast Damper In Place 

• Cycle Damper After Installation To Insure Free Movement 

• Do Not Install Damper Out Of Round 

Note: Caution heavy spring used to load spring/link actuator use care 

in resetting link. 

Splice Clip Detail 

All dimensions in inches 

A and B = Damper Dia. 

plus 3” (76 mm) 

Cut (Cover with 

Splice Clip) 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-37 Rev 7 Page 1 of 2 

D 

2 

Retaining Plate Detail 

+ 1-1/2” 

(38 mm)

6B. Option 2: The damper may also be installed in a steel stud/gypsum, 

or masonry wall, in a vertical position (blade running horizontal), 

with a retaining plate on one side of the wall. Installation: with the 

factory installed retaining plate flush to the fire wall, place 8 screws 

(#10 sheet metal for steel studs long enough to penetrate the metal 

stud by 1/2” minimum or #10 x 1-1/4” masonry screws) equidistant 

around the perimeter of the retaining plate. Screws are placed in each 

corner and halfway between the corners as shown. 

7. Electrical and/or pneumatic connections to damper actuators (if 

applicable) should be made in accordance with wiring and piping 

diagrams developed in compliance with applicable codes, ordinances 

and regulations. 

8. Refer to the installation instruction for Drywall Type Construction 

for the material and opening framing details. 



Installation Instructions continued 







This installation sheet has been reviewed and accepted by 

Underwriters Laboratories. 


Toll free: 800.585.7686 +1.708.552.4040 


Typical masonry or metal stud opening. (Refer 

to metal stud framing for fire dampers in drywall 

partitions) 

P-37 Rev 7 Page 2 of 2 © 2012 Metropolitan Air Technology. All rights reserved. 7/12


Toll free: 800.585.7686 +1.708.552.4040 



Optional Sealing In Dampers In Fire & Smoke Rated 

Wall/Floor Openings Installation Instructions 

Note: Only if required by the Authority having jurisdiction 

Application 

The need to seal the damper in the penetration is not required by 

Underwriters Laboratories. MAT dampers have been tested and 

approved to be mounted without the use of sealants around the 

perimeter space between the damper and the penetration. In certain 

cases, local codes that request that this space be sealed to try and 

keep the integrity of the smoke barrier. These instructions have been 

produced to give direction where to apply caulk, if required by local 

codes. Suggested brands of caulk to use are Dow Corning 999, Dow 

Corning Silastic 732, Nuflex 302 and GE RTV 108 Sealant. Read and 

follow the sealant manufacturer’s directions. Apply a continuous bead 

of caulk in the areas shown below. Do Not Apply sealant within the 

required expansion gap between the damper and the fire rated wall or 

floor. Allow the sealant to set up and become tack-free before operating 

the damper. See MAT’s standard installation instructions for the 

basic installation of the damper. These instructions are for use 

following damper installation. Permission from the local codes 

inspector should be acquired before use of these instructions, to 

insure conformity with the local codes. 

Procedure 

1. Follow standard/general installation instructions for proper installation 

of the damper in the wall / floor. 

(1) Fire and smoke rated wall or floor 

(2) Retaining Angles 

(3) Fire, Smoke or Combination, Fire/Smoke damper 

(4) Sleeve 

(5) Fasteners 

(6) Sealant to Wall 

(7) Sealant to Sleeve 

1 

2 

2. Clean all areas where the sealant is going to be applied. Remove 

dirt, oil, grease, or moisture from surface to be sealed. Allow to dry 

thoroughly. 

3. Using G.E. RTV 108, Dow Corning Silastic 732 RTV, Nuflex 302 or 

Dow Corning 999 Silicone Caulk, apply a continuous bead around 

the outside perimeter of the retaining angle, sealing them to the 

fire wall/floor (6). Do not apply caulk between angle and wall/floor. 

Also apply a continuous bead between the retaining angle and the 

damper sleeve(7). Be sure to seal the joints/corners of the retaining 

angles. 

4. Be sure not to apply or get sealant within the required expansion 

gap between the sleeve and the fire wall/floor penetration. This gap 

is necessary for thermal expansion in the event of a fire. 

5. After sealant is applied and before it sets-up, press the surface of 

the sealant in place to dispel any air. Do not operate the damper 

until the sealant has become tack-free. 



intervals not greater than every 12 months or in accordance with 

the latest edition of NFPA 90A, 92A, local codes and the actuator 

manufacturer. In addition, fuse links shall be removed and inspected 

for corrosion. Dry lubricants are recommended. 

Angles Turned In Angles Turned Out 

3 

4 

5 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-38 Rev 2 

6 

7 

7 

6 

4 

2 

1 

5 

3 

6 

6 

7 

7

These installation instructions apply to the fabrication and construction 

of generic support mullions. Support mullions are necessary 

whenever fire dampers are installed into an opening that is larger 

than the largest UL rated size for that damper. The mullions allow 

construction of a fire barrier that is larger than the maximum UL available 

size. 

The opening must not exceed 120” high, but can be any width provided 

a vertical support mullion is used at a maximum of every 120”. 

To properly use support mullions they must be fabricated and 

installed according to these instructions. 

This generic support mullion is permitted by UL to only be used in 

static systems. A static system is one in which the fan shuts down in 

the event of a fire or smoke alarm. 


Generic Support Mullions Fabrication & Installation 

Instructions 

Application 

Generic steel mullions can be used to separate vertically mounted 

galvanized steel fire dampers in wall openings larger than the UL 

permitted multiple damper assembly size. Mullions can either be 

used vertically, horizontally or both to split up a vertical wall opening 

requiring use of a damper having a 1-1/2 hour fire resistance rating. 

Maximum mullion span is 120” plus expansion allowance when used 

either horizontally or vertically. 

Sleeves are to be around each damper assembly. Mullions are not 

intended to be in the airstream, (i.e. exposed to flow) or to be a part 

of the ductwork. 

Wall Opening 

Steel mullions are intended for use in a concrete block or solid 

concrete wall. Hollow concrete blocks are to be filled with concrete 

(minimum 3500 psi) to permit proper mullion anchoring. Wall thickness 

is to be 7” minimum, 12” maximum. 


Toll free: 800.585.7686 +1.708.552.4040 


P-39a Rev 3 Page 1 of 4 © 2012 Metropolitan Air Technology. All rights reserved. 7/12

Support mullion assemblies consist of three basic parts: the wall 

mullion cap, the horizontal to vertical mullion cap and the mullion 

sections. Determine the number of each piece required to complete 

the installation. 

Fabrication of Wall Mullion Caps (Fig. A-A) 

Wall mullion caps must be constructed from 12 ga. steel with a 

minimum yield strength of 42,000 psi. 

1. Fabricate the formed section as shown to right. 

2. Shear the cap end plate to required dimensions. 

3. Weld the cap end plates to the formed section with 1/8” fillet welds 

completely around the top edges of the formed section. 

4. Drill and countersink 8 holes (4 on each side for 1/4 - 20 flat head 

machine screws. 

Fabrication of Mullion Sections (Fig. B-B) 

Mullions must be constructed from 16 ga. steel with a minimum 

yield strength of 42,000 psi. 

Important: The “D’’ dimension shown has been calculated to include 

the necessary clearances required for thermal expansion in the 

mullions. The values can be found using the wall opening dimensions 

and tables on this page. 

1. Form two identical pieces of mullion section as shown. 

2. Connect the two mullion sections together. Use 3/16” steel bind 

rivets or 3/4” long intermittent welds 12” on center and a 6” 

maximum from both ends. 

Important: Both sides of the mullion piece should be fastened 

using the method described above. 


Toll free: 800.585.7686 +1.708.552.4040 




Instructions continued 

Table 1 

Dimensional Information 

Opening 

Width/Height D H 

12 11-1/2” 3-1/4” 

24 23-1/2” 3-3/8” 

36 33-3/8” 3-1/2” 

48 47-1/4” 3-5/8” 

60 59-1/8” 3-3/4” 

72 71” 3-7/8” 

84 82-7/8” 4” 

96 94-3/4” 4-1/8” 

108 106-3/4” 4-1/4” 

120 118-3/4” 4-3/8” 

E = Wall Thickness – 1/2” 

F = Wall Thickness + 1/4” 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-39b Rev 1 Page 2 of 4

Fabrication of Horizontal to Vertical Mullion Caps (Fig. C-C) 

Horizontal to vertical mullion caps must be constructed from 12 ga. 

steel with a minimum yield strength of 42,000 psi. Important: The H, E 

and F dimensions shown have been calculated to provide the correct 

performance. The values can be found by using the wall opening 

dimensions and the tables on page 2. 

1. Form the horizontal mullion channel as shown. 

2. Drill 12, 3/16” dia. holes into the horizontal mullion channel using 

the dimensions shown. 

3. Form the center channel as shown. 

NOTE: If the center channel is to be made from two pieces, weld 

them together with an 1/8” fillet weld. 

4. Shear the end plates to the dimensions required. 

5. Weld the end plates to the center channel with 1/8” fillet welds 

completely around the top edges of the center section. 





Toll free: 800.585.7686 +1.708.552.4040 


P-39c Page 3 of 4 © 2012 Metropolitan Air Technology. All rights reserved. 7/12


Toll free: 800.585.7686 +1.708.552.4040 





Mullion Installation 

Before the fire dampers are installed into the wall the mullions must 

first be anchored into the wall. The fire dampers may then be installed 

into the mullion assembly. 

To correctly attach the mullions to the wall follow these steps: 

1. Anchor wall mullion caps to wall using 1/4-20 x 5/16” long flat 

head steel bolts and 3/8” diameter by 1” long concrete expansion 

anchors (Hilti). If steel lintels are present, use two 1” long welds on 

each side of mullion caps. 

Note: End caps must be inserted into the ends of the mullions 

before they are anchored to the wall. 

2. Anchor horizontal mullion caps to vertical mullion caps with 3/16” 

diameter steel blind rivets in 12 places. 

Note: Mullion caps must be inserted into the ends of the mullions 

before they are anchored to the vertical mullions or wall. 

Fire Damper Installation 

Galvanized steel fire dampers must be UL classified for 1-1/2 hour 

fire resistance.They must be installed in galvanized steel sleeves and 

be retained by minimum 1-1/2” x 1-1/2”, 16 ga. retaining angles on 

each side of the wall. Retaining angles must overlap mullions or wall 

by 1” minimum. Fasten to sleeve using 1/4” dia.bolts, 3/16” steel 

rivets, welding, or #10 sheet metal screws. All must be attached 6” on 

centers, 2” maximum from corners. Do not fasten retaining angles to 

the wall or mullions. Mullions must be free to float. Total expansion 

clearance between sleeve and wall/mullion of 1/8” per foot of wall 

opening or mullion span should be allowed. Maximum clearance is 

1-1/4”. 







© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-39d Page 4 of 4



Combination Fire/Smoke Dampers

Options 

• Factory sleeves (20 Ga minimum. 16” min 

length) 16” X 20 ga. side plate provided if no 

sleeve is indicated 


• One Side 


• Smoke Detector 

• Ionization or Photoelectric 

• Transitions 

• Round or Oval 

• Micro-Switch Package 

• RCB-1, -2, -3, -4 

• DTO/RE w/ MS Package 

• Actuator 

• Electric 

• Pneumatic. 25 psi 

• Grille Mtg. - 3/4” Mounted Face Flange 

• Shipped loose (if external actuator) 

• Mounting Orientation 


• Vertical 

F/S-3V-I (1-1/2 hour), F/S-3V-3-I (3 hour) 

16 


Model F/S-3V-I & F/S-3V-3-I Combo Fire/Smoke 

Damper UL 555 Classified 1.5 & 3 hour rated, UL 555S Classified Class I Leakage 

Single Section Dampers 

Actuator Mounting Standard 

Left Side Facing Jackshaft 

(Right Hand available on request) 



Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The F/S-3V-I or F/S-3V-3-I series Combination Fire/Smoke Dampers 

have been designed and tested to exceed all UL and N.F.P.A. requirements 

for fire dampers as well as smoke dampers. 

• F/S-3V-I is UL 555 and labeled as a 1-1/2 hour fire damper. 

• F/S-3V-3-I is UL 555 and labeled as a 3 hour fire damper. 

• UL Classified for both vertical and horizontal mountings. 

• UL 555S Classified and labeled as a Leakage Class I rated Smoke 

Damper with airflow in both directions. Class I provides for a max. leakage 

of 8 cfm per sq. ft. at 4.0 inches static pressure. 

• UL 555S Classified at 250 °f or 350 °f depending upon motor/operator 

*see motor/operator schedule 

• Not recommended with blades running vertically 


• Frame: Roll-formed galvanized steel hat-section with staked corners 

with integral bracing. 

• Blades: 16ga. Roll-formed galvanized steel. 

• Minimum width: 4.250” (108mm) 

• Maximum width: 7.250” (184mm) 

• Bearings: Bronze Oilite, press-fit into frame. 

• Axles: Square, plated steel. 

• Seals: Pressure sensitive 450˚ F silicone blade edge seals and flexible 

metal jamb seals. 

• Linkage: Concealed in frame. Linkage bars are .125” (3.2mm) thick 

plated steel. 

• Controlled Closure Device: (Heat Activated) 

• EFL - 165˚ F Standard, 212˚, 250˚, 350˚ F available 

• PFL - 165˚ F Standard, 212˚ F available 

• Finish: Mill galvanized. 


• Maximum Pressure: 4” wg (1kPa) 

• Non-Sleeved dampers with side plate are furnished approximately 1/4” 


furnished approx. same size as given duct dimension, unless otherwise 

noted 

Min. Size 8”w x 6”h (203mm x 152mm) 

Max. Size Single Section: 36”w x 48”h (914mm x 1219mm) 

1-1/2hr. Vertical: 108”w x 96”h (2743mm x 2438mm) 

1-1/2hr. Horizontal: 72”w x 96”h (1828mm x 2438mm) 

3hr. Vertical: 72”w x 48”h (1828mm x 1219mm) 

3hr. Horizontal: 72”w x 48”h (1828mm x 1219mm) 


F/S-3V-I (1-1/2 hour), F/S-3V-3-I (3 hour) 




Suggested Specification 

Combination Fire/Smoke Dampers shall be Model: F/S-3V-I, OR F/S-3V-3-I, by Metropolitan Air 

Technology. Fire/Smoke Dampers shall bear the Underwriters’ Laboratories labels for both Fire 

Dampers and Smoke Dampers. UL 555S rating shall be Class I with leakage not to exceed 8 cfm 

per sq. ft. at 4.0 inches static pressure for any size. Linkage shall be of the concealed type for 

maximum free area. 

Manufacturers Recommendations 

It is recommended the damper must be inspected and cycled at intervals not greater than 

every twelve months or in accordance with NFPA 80, 90A, 92A, local codes and the actuator 

manufacturer. 


Toll free: 800.585.7686 +1.708.552.4040 


P-40a Rev 6 © 2012 Metropolitan Air Technology. All rights reserved. 7/12


Toll free: 800.585.7686 +1.708.552.4040 





Performance Data 

Pressure drop testing was done by an independent laboratory 

to the AMCA Standard 500-D, Fig. 5.3 ductwork upstream & 

downstream. 

When the actuator is externally mounted and the wall thickness 

exceeds 5 inches, add 1 inch for each additional inch of 

wall thickness increased to ensure sleeve length through the 

penetration. As standard the actuator is externally installed 

on the lower right hand half of the damper when viewed from 

the jack shaft side. The damper may be installed/rotate 180° 

such the actuator will be located on the upper left. The top of 

the damper is either side of the frame as long as the blades 

are running horizontal. When ordering internally mounted 

actuators, be aware there is a min. height requirement (in 

some cases the sleeve can be increased to allow for internally 

mounting). The entire damper frame does not have to 

be installed in the plane of the wall of floor. The rule of thumb 

is with the damper in the closed position, the blade plane 

should be within the plane of the UL rated wall or floor. 

16” 

Optional Sleeve 


Options 





• One Side 







• RCB-1, -2, -3, -4 


• Actuator 

• Electric 






• Vertical 

16 

F/S-3V-II (1-1/2 hour), F/S-3V-3-II (3 hour) 


Model F/S-3V-II & F/S-3V-3-II Combo Fire/Smoke 

Damper UL 555 Classified 1.5 & 3 hour rated, UL 555S Classified Class II Leakage 






Application 

• The F/S-3V-II or F/S-3V-3-II series Combination Fire/Smoke Dampers 

have been designed and tested to exceed all U.L and N.F.P.A. requirements 


• F/S-3V-II is UL 555 Classified and labeled as a 1-1/2 hour fire damper. 

• F/S-3V-3-II is UL 555 Classified and labeled as a 3 hour fire damper. 


• UL 555S Classified and labeled as a Leakage Class II rated Smoke 

Damper with airflow in both directions. Class II provides for a maximum 

leakage of 20 cfm per sq. ft. at 4.0 inches static pressure. 














• Linkage: Concealed in frame. Linkage bars are .125” (3.2mm) thick plated 

steel. 

• Controlled Closure Devices: (Heat Activated) 









noted. 








Toll free: 800.585.7686 +1.708.552.4040 



F/S-3V-II (1-1/2 hour), F/S-3V-3-II (3 hour) 


Toll free: 800.585.7686 +1.708.552.4040 




Damper UL 555 Classified 1.5 & 3 hour rated, UL 555S Classified Class II Leakage 


Combination Fire/Smoke Dampers shall be Model: F/S-3V-II, by Metropolitan Air Technology. 

Fire/Smoke Dampers shall bear the Underwriters’ Laboratories labels for both Fire Dampers and 

Smoke Dampers. UL 555S rating shall be Class II with leakage not to exceed 20 cfm per sq. ft. 

at 4.0 inches static pressure for any size. Linkage shall be of the concealed type for maximum 

free area. 




manufacturer. 





downstream. 

When the actuator is externally mounted and the wall thickness 

exceeds 5 inches, add 1 inch for each additional inch of 

wall thickness increased to ensure sleeve length through the 

penetration. As standard the actuator is externally installed 

on the lower right hand half of the damper when viewed from 

the jack shaft side. The damper may be installed/rotate 180° 

such the actuator will be located on the upper left. The top of 

the damper is either side of the frame as long as the blades 

are running horizontal. When ordering internally mounted 

actuators, be aware there is a min. height requirement (in 

some cases the sleeve can be increased to allow for internally 

mounting). The entire damper frame does not have to 

be installed in the plane of the wall of floor. The rule of thumb 

is with the damper in the closed position, the blade plane 

should be within the plane of the UL rated wall or floor. 




16” 



Toll free: 800.585.7686 +1.708.552.4040 


P-41b Rev © 2012 Metropolitan Air Technology. All rights reserved. 7/12

Options 





• One Side or Both Sides 






• RCB-1, -2, -3, -4 


• Actuator 

• Electric or Pneumatic. 25 psi 




• Horizontal or Vertical 

F/S-AF-I (1-1/2 hour), MODEL F/S-AF-3-I (3 hour) 


Model F/S-AF-I & F/S-AF-3-I Airfoil Blade Combo Fire/Smoke 

Damper UL 555 Classified 1.5 & 3 hour rated, UL 555S Classified Class I (low pressure drop 

airfoil blade per AMCA standard 500-D) 






Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The F/S-AF-I or F/S-AF-3-I series Combination Fire/Smoke Dampers 

have been designed and tested to exceed all UL, and N.F.P.A. requirements 


• F/S-AF-I is UL 555 Classified and labeled as a 1-1/2 hour fire damper. 

• F/S-AF-3-I is UL 555 Classified and labeled as a 3 hour fire damper. 



Damper with airflow in both directions. Class I provides for a maximum 

leakage of 8 cfm per sq. ft. at 4.0 inches static pressure 







• Blades: Airfoil-shaped, double skin galvanized steel of roll-formed construction. 

Mechanically joined to form construction equivalent to 14ga. steel. 

• Minimum width: 5” (127mm) 

• Maximum width: 7” (178mm) 






plated steel. 






• Maximum Pressure: 4” wg (1kPa) Consult Factory For Velocities up to 

4000 FPM and 6.0” w.g. 




noted. 













Combination Fire/Smoke Dampers shall be Model: F/S-AF-I, by Metropolitan Air Technology. 

Damper blades shall be of double-skinned streamlined (“airfoil”) construction for minimum pressure 

drop. Both blade edge and jamb seals shall be of the pressure sensitive type for low leakage. 

Dampers shall be rated for both Fire Damper (UL 555) and Smoke Damper (UL 555S) operation. 

Leakage shall not exceed 8 cfm per sq. ft. at 4.0 inches static pressure. Linkage shall be of the 

concealed type for maximum free area. Dampers shall bear the Underwriters’ Laboratories labels. 




manufacturer. 


F/S-AF-I (1-1/2 hour), MODEL F/S-AF-3-I (3 hour) 


Toll free: 800.585.7686 +1.708.552.4040 




Toll free: 800.585.7686 +1.708.552.4040 









downstream. When the actuator is externally mounted and 

the wall thickness exceeds 5 inches, add 1 inch for each 

additional inch of wall thickness increased to ensure sleeve 

length through the penetration. As standard the actuator is 

externally installed on the lower right of the damper when 

viewed from the jack shaft side. The damper may be installed/ 

rotate 180° such the actuator will be located on the upper left. 

The top of the damper is either side of the frame as long as 

the blades are running horizontal. When ordering internally 

mounted actuators, be aware there is a min. height requirement 

(in some cases the sleeve can be increased to allow 

for internally mounting). The entire damper frame does not 

have to be installed in the plane of the wall of floor. The rule of 

thumb is with the damper in the closed position, the blade 

plane should be within the plane of the UL rated wall or floor. 



Options 





• One Side or Both Sides 






• RCB-1, -2, -3, -4 


• Actuator 







Model F/S-AF-II & F/S-AF-3-II Airfoil Blade Combo Fire/Smoke 

Damper UL 555 Classified 1.5 & 3 hour rated, UL 555S Classified Class II (low pressure drop 







F/S-AF-II (1-1/2 hour), MODEL F/S-AF-3-II (3 hour) 

Application 

• The F/S-AF-II or F/S-AF-3-II series Combination Fire/Smoke Dampers 

• have been designed and tested to exceed all UL and N.F.P.A. requirements 


• F/S-AF-II is UL 555 Classified and labeled as a 1-1/2 hour fire damper. 

• F/S-AF-3-II is UL 555 Classified and labeled as a 3 hour fire damper. 




















plated steel. 

• Controlled Closure Devises: (Heat Activated) 






4000 FPM and 6.0” w.g. 




noted. 








Toll free: 800.585.7686 +1.708.552.4040 




Toll free: 800.585.7686 +1.708.552.4040 







Combination Fire/Smoke Dampers shall be Model: F/S-AF-II, by Metropolitan Air Technology 




Leakage shall not exceed 20 cfm per sq. ft. at 4.0 inches static pressure. Linkage shall be of the 

concealed type for maximum free area. Dampers shall beat the Underwriters’ Laboratories labels. 




manufacturer. 

F/S-AF-II (1-1/2 hour), MODEL F/S-AF-3-II (3 hour) 





downstream. When the actuator is externally mounted and 

the wall thickness exceeds 5 inches, add 1 inch for each additional 

inch of wall thickness increased to ensure sleeve 

length through the penetration. As standard the actuator is 

externally installed on the lower right of the damper when 

viewed from the jack shaft side. The damper may be installed/ 

rotate 180° such the actuator will be located on the upper left. 

The top of the damper is either side of the frame as long as 

the blades are running horizontal. When ordering internally 

mounted actuators, be aware there is a min. height requirement 

(in some cases the sleeve can be increased to allow 

for internally mounting). The entire damper frame does not 

have to be installed in the plane of the wall of floor. The rule 

of thumb is with the damper in the closed position, the blade 

plane should be within the plane of the UL rated wall or floor. 







Toll free: 800.585.7686 +1.708.552.4040 



Suggested Specifications 

Combination Fire/Smoke Dampers shall be Model: 

F/S-RD-I by Metropolitan Air Technology. Fire/ 

Smoke Dampers shall bear the Underwriter Laboratories 

labels for both Fire Dampers and Smoke 

Dampers. UL 555S rating shall be Class I with 

Leakage in cfm per sq. ft. not to exceed 8 cfm per 

sq. ft. at 4.0 inches static pressure for any size. 


It is recommended the damper must be inspected 

and cycled at intervals not greater than every 

twelve months or in accordance with NFPA 80, 

90A, 92A, local codes and the actuator 

manufacturer. 

Notes 

Retaining plate on operator side of damper is 

installed at the factory. Dampers are furnished 

approximately 1/8” (3.2 mm) smaller then given 

duct dimensions. 



F/S-RD-I (1-1/2 hour) 

Model F/S-RD-I True Round Combo Fire/Smoke Damper 

UL 555 Classified 1.5 & 3 hour rated, UL 555S Classified Class I Leakage (low pressure 

drop airfoil blade per AMCA standard 500-D) 

Application 

• The F/S-RD-I series Combination Fire/Smoke Dampers have been 

designed and tested to exceed all UL and N.F.P.A. requirements for 

fire dampers as well as smoke dampers. They are intended for use 

where building codes call for a fire damper to also operate as a smoke 

damper. 

• UL 555 Classified and labelled as a 1-1/2 hour fire damper. 

• UL Classified for vertical and horizontal mountings. 



leakage of 8 cfm per sq. ft at 4.0 inches static pressure. 




• Frame: Roll-formed galvanized steel,16” (406 mm) long, integral sleeve. 

• Blades: Double thickness galvanized steel, 14 ga. equivalent with 

welded channel reinforcement. 

• Bearings: Bronze Oilite press-fit into frame. 

• Axles: 3/8” (9.5 mm) square plated steel. 

• Seals: Pressure sensitive 450 °F silicone sandwiched between blades. 

• Linkage: Jackshaft to blade. 


• EFL - 165 °F Standard, 212, 250, 350 °F 

• PFL - 165 °F Standard, 212 °F available 


• Retaining Plates: (2) 20 ga. galvanized steel complete with angle clips. 



Min. Size 8” (203 mm) diameter 

Max. Size 24” (610mm) diameter 

Options 

• 20” Sleeve/body 


• Actuator 

• Electric 

• Pneumatic, 25 PSI 

• Smoke Detector* 

• Ionization 

• Photoelectric 

*Must have 24” Sleeve 



• RCB-1, -2, -3, -4 


Toll free: 800.585.7686 +1.708.552.4040 





to AMCA Standard 500-D, Fig. 5.3 ductwork upstream & 

downstream. 

Leakage obtained in test of 8” diameter and 24” diameter was 

less than 1 cfm/sq. Ft. 


Model F/S-RD-I True Round Combo Fire/Smoke Damper 

UL 555 Classified 1-1/2 Hours / UL 555S Classified Class I 


Toll free: 800.585.7686 +1.708.552.4040 


P-44a © 2012 Metropolitan Air Technology. All rights reserved. 7/12

Suggested Specifications 

Combination Fire/Smoke Dampers shall be Model: 

F/S-RD-II by Metropolitan Air Technology. Fire/ 

Smoke Dampers shall bear the Underwriter Laboratories 

labels for both Fire Dampers and Smoke 

Dampers. UL 555S rating shall be Class II with 

Leakage in cfm per sq. ft. not to exceed 20 cfm per 

sq. ft. at 4.0 inches static pressure for any size. 

F/S-RD-II (1-1/2 hour) 


Model F/S-RD-II True Round Combo Fire/Smoke 

Damper UL 555S Classified Class II Leakage 

Application 

• The F/S-RD-II series Combination Fire/Smoke Dampers have been 

designed and tested to exceed all UL and N.F.P.A. requirements for 

fire dampers as well as smoke dampers. They are intended for use 

where building codes call for a fire damper to also operate as a smoke 

damper. 

• UL 555 Classified and labelled as a 1-1/2 hour fire damper. 

• UL Classified for vertical and horizontal mountings. 



leakage of 20 cfm per sq. ft at 4.0 inches static pressure. 




• Frame: Roll-formed galvanized steel,16” (406 mm) long, integral sleeve. 

• Blades: Double thickness galvanized steel, 14 ga. equivalent with 

welded channel reinforcement. 

• Bearings: Bronze Oilite press-fit into frame. 

• Axles: 3/8” (9.5 mm) square plated steel. 

• Linkage: 1/2” (12.7 mm) diameter plated steel. 

• Seals: Pressure sensitive 450 °F silicone sandwiched between blades. 

• Linkage: Jackshaft to blade. 


• EFL - 165 °F Standard, 212, 250, 350 °F available 

• PFL - 165 °F Standard, 212 °F available 


• Retaining Plates: (2) 20 ga. galvanized steel complete with angle clips. 



Min. Size 8” (203 mm) diameter 

Max. Size 24” (610mm) diameter 

Notes 

Options 

Retaining plate on operator side of damper is • 20” Sleeve/body 

installed at the factory. 


Dampers are furnished approximately 1/8” (3.2 • Actuator 

mm) smaller then given duct dimensions. 

• Electric 

• Pneumatic, 25 PSI 



It is recommended the damper must be inspected • Ionization 

and cycled at intervals not greater than every • Photoelectric 



90A, 92A, local codes and the actuator manufac- • DTO/RE w/ MS Package 

turer. 


• RCB-1, -2, -3, -4 



Toll free: 800.585.7686 +1.708.552.4040 






downstream. 

Leakage obtained in test of 8” diameter and 24” diameter was 

less than 1 cfm/sq. Ft. 


Model F/S-RD-II True Round Combo Fire/Smoke 



Toll free: 800.585.7686 +1.708.552.4040 



Options 



• Actuator 



• One Side 

• Grille Mtg. - 1” Mounted Face Flange, STD 










• RCB-1, -2, -3, -4 




F/S-3V-FA-I (1-1/2 hour) 

Model F/S-3V-FA-I Front Access Combo Fire/Smoke 

Damper UL 555 Classified 1.5 hour rated, UL 555S Classified Class I Leakage 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The F/S-3V-FA-I series Combination Fire/Smoke Dampers have been 

designed and tested to exceed all UL and N.F.P.A. requirements for fire 

dampers as well as smoke dampers. They are intended for use where 

building codes call for the fire damper to also operate as a smoke 

damper. 

• F/S-3V-FA-I is UL 555 Classified and labeled as a 1-1/2 hour fire damper. 

• UL Classified for vertical. 


















plated steel. 

• Sleeve: Galvanized, wrapped in thermal blanket. (Typ. 3 sides) 







• Sleeved dampers are furnished approximately same size as given duct 

dimension plus 3/8” for insulation, unless noted otherwise. 



Notes 

Wall opening must be oversized by 3/4” (19mm) to accommodate thermal 

blanket thickness 


F/S-3V-FA-I (1-1/2 hour) 





Combination Fire/Smoke Dampers shall be Model: F/S-3V-FA-I by Metropolitan Air Technology. 


Smoke Dampers. Each damper shall be UL qualified for mounting outside of the plane of the wall 

and have concealed actuator access, from grille side, to allow through the grille access to 

actuator and controls. UL 555S rating shall be Class I with leakage not to exceed 8 cfm per sq. ft. 

at 4.0 inches static pressure for any size. Linkage shall be of the concealed type for the maximum 

free area. 




manufacturer. 


Toll free: 800.585.7686 +1.708.552.4040 




Toll free: 800.585.7686 +1.708.552.4040 








downstream. 


Options 



• Actuator 



• One Side 

• Grille Mtg. - 1” Mounted Face Flange, STD 










• RCB-1, -2, -3, -4 


F/S-3V-FA-II (1-1/2 hour) 


Model F/S-3V-FA-II Front Access Combo Fire/Smoke 

Damper UL 555 Classified 1.5 hour rated, UL 555S Classified Class II Leakage 

Application 

• The F/S-3V-FA-II series Combination Fire/Smoke Dampers have been 


dampers as well as smoke dampers. They are intended for use where 

building codes call for the fire damper to also operate as a smoke damper. 

• F/S-3V-FA-II is UL 555 Classified and labeled as a 1-1/2 hour fire damper. 

• UL Classified for vertical mountings. 


















plated steel. 







• Finish: Mill galvanized 


dimension plus 3/8” for insulation, unless noted otherwise. 



Notes 

Wall opening must be oversized by 3/4” (19mm) to accommodate thermal 

blanket thickness 


Toll free: 800.585.7686 +1.708.552.4040 



F/S-3V-FA-II (1-1/2 hour) 


Toll free: 800.585.7686 +1.708.552.4040 






Combination Fire/Smoke Dampers shall be Model: F/S-3V-FA-II by Metropolitan Air Technology. 


Smoke Dampers. Each damper shall be UL qualified for mounting outside of the plane of the 

wall and have concealed actuator access, from grille side, to allow through the grille access to 

actuator and controls. UL 555S rating shall be Class II with leakage not to exceed 20 cfm per sq. 

ft. at 4.0 inches static pressure for any size. Linkage shall be of the concealed type for the maximum 

free area. 




manufacturer. 





downstream. 





Toll free: 800.585.7686 +1.708.552.4040 



Actuator mounted 

internal as standard 

+ Typical 4 sides when mounted horizontally 



F/S-3V-OW-I (1-1/2 hour) 

Model F/S-3V-OW-I Outside Wall Combo Fire/Smoke 


* Wall opening must be oversized by 3/4” (19mm) 

to accommodate thermal blanket thickness. 

Options 





• One Side 






• RCB-1, -2, -3, -4 


• Actuator 







Toll free: 800.585.7686 +1.708.552.4040 


* 

* 

Application 

• The F/S-3V-OW-I series Combination Fire/Smoke Dampers have been 


dampers as well as smoke dampers. 

• F/S-3V-OW-I is UL 555 Classified and labeled as a 1-1/2 hour fire damper. 



















plated steel. 

• Sleeve: Galvanized, wrapped in thermal blanket. (Vert. Typ. 3 sides) 16”, 

20 std 









Multi Section: 42”w x 48”h (1067mm x 1219mm) 

Notes 

Face flange shipped loose if external actuator 


F/S-3V-OW-I (1-1/2 hour) 


Model F/S-3V-OW-I Outside Wall Combo Fire/Smoke 



Combination Fire/Smoke Dampers shall be Model: F/S-3V-OW-I, by Metropolitan Air Technology. 



to allow ‘through the grille’ access to actuator and controls. UL 555S rating shall be Class I with 

leakage not to exceed 8 cfm per sq. ft. at 4.0 inches static pressure for any size. Linkage shall be 

of the concealed type for maximum free area. 




manufacturer. 


Toll free: 800.585.7686 +1.708.552.4040 



Actuator 

mounted 

internal as 

standard 



Toll free: 800.585.7686 +1.708.552.4040 



Model F/S-3V-OW-II Outside Wall Combo Fire/Smoke 


* 



Options 





• One Side 






• RCB-1, -2, -3, -4 


• Actuator 







F/S-3V-OW-II (1-1/2 hour) 

* 

Application 

• The F/S-3V-OW-II series Combination Fire/Smoke Dampers have been 



• F/S-3V-OW-II is UL 555 Classified and labeled as a 1-1/2 hour fire 

damper. 






*See motor/operator schedule 













plated steel. 

• Sleeve: Galvanized, wrapped in thermal blanket. (Vert. Typ. 3 sides), 20 

Ga, 16” Std. 










Notes 



F/S-3V-OW-II (1-1/2 hour) 


Model F/S-3V-OW-II Outside Wall Combo Fire/Smoke 



Combination Fire/Smoke Dampers shall be Model: F/S-3V-OW-II, by Metropolitan Air Technology. 



to allow ‘through the grille’ access to actuator and controls. UL 555S rating shall be Class II with 

leakage not to exceed 20 cfm per sq. ft. at 4.0 inches static pressure for any size. Linkage shall be 

of the concealed type for maximum free area. 




manufacturer. 


Toll free: 800.585.7686 +1.708.552.4040 



Actuator mounted 

internal as standard 


W* 



F/S-AF-OW-I (1-1/2 hour) 

Model F/S-AF-OW-I Outside Wall Combo Fire/Smoke 

Damper UL 555S Classified Class I Leakage 

H* 



Options 





• One Side 






• RCB-1, -2, -3, -4 


• Actuator 





Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The F/S-AF-OW-I series Combination Fire/Smoke Dampers have been 

• designed and tested to exceed all UL and N.F.P.A. requirements for fire 


• F/S-AF-OW-I is UL 555 Classified and labeled as a 1-1/2 hour fire damper. 




leakage of 8 cfm per sq. ft. at 4.0 inches static pressure. UL 555S 

Classified at 250 °f or 350 °f depending upon motor/operator 







Mechanically joined to form construction equivalent to 14ga. 

steel. 








plated steel. 

• Sleeve: Galvanized, wrapped in thermal blanket. (Vert. Typ. 3 sides), 

• 20 Ga, 16” Std. 





• Maximum Velocity: 2000 fpm (10.2 m/s) on sizes 


4000 FPM and 6.0” w.g. 





F/S-AF-OW-I (1-1/2 hour) 


Model F/S-AF-OW-I Outside Wall Combo Fire/Smoke 



Combination Fire/Smoke Dampers shall be Model: F/S-AF-OW-I, by Metropolitan Air Technology. 




Leakage shall not exceed 8cfm per sq. ft. at 4.0 inches static pressure. Linkage shall be of the 

concealed type for maximum free area. Each damper shall be qualified for mounting outside of the 

plane of the wall to allow ‘through the grille’ access to actuators and controls. Dampers shall bear 

the Underwriters’ Laboratories labels. 




manufacturer. 


Toll free: 800.585.7686 +1.708.552.4040 



Actuator 

mounted 

internal 

as standard 


W* 

* Wall opening must be oversized by 3/4” 

(19mm) to accommodate thermal blanket 

thickness. 

*Thermal Blanket 

Typical 3 Sides + 

See NOTE bottom left 

Options 





• One Side 






• RCB-1, -2, -3, -4 


• Actuator 




F/S-AF-OW-II (1-1/2 hour) 


Toll free: 800.585.7686 +1.708.552.4040 



Model F/S-AF-OW-II Outside Wall Combo Fire/Smoke 


H* 


Application 

• The F/S-AF-OW-II series Combination Fire/Smoke Dampers have been 



• F/S-AF-OW-II is UL 555 Classified and labeled as a 1-1/2 hour fire damper. 






*See motor/operator schedule 














plated steel. 

• Sleeve: Galvanized, wrapped in thermal blanket. (Vert. Typ. 3 sides), 20 

Ga, 16” std. 







• Consult Factory For Velocities up to 4000 FPM and 6.0” w.g. 




Notes 



F/S-AF-OW-II (1-1/2 hour) 


Model F/S-AF-OW-II Outside Wall Combo Fire/Smoke 



Combination Fire/Smoke Dampers shall be Model: F/S-AF-OW-II, by Metropolitan Air Technology. 




Leakage shall not exceed 20cfm per sq. ft. at 4.0 inches static pressure. Linkage shall be of the 

concealed type for maximum free area. Each damper shall be qualified for mounting outside of the 

plane of the wall to allow ‘through the grille’ access to actuators and controls. Dampers shall bear 

the Underwriters’ Laboratories labels. 




manufacturer. 


Toll free: 800.585.7686 +1.708.552.4040 



* Wall opening must be oversized by 

3/4” (19mm) to accommodate thermal 

blanket thickness. 

Options 





• One Side 






• RCB-1, -2, -3, -4 


• Actuator 






F/S-AF-FA-I (1-1/2 hour) 

Model F/S-AF-FA-I Front Access Combo Fire/Smoke 

Damper low pressure drop airfoil blade per AMCA standard 500-D UL 555S 

Classified Class 1 Leakage 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The F/S-AF-FA-I series Combination Fire/Smoke Dampers have been 



• F/S-AF-FA-I is UL 555 Classified and labeled as a 1-1/2 hour fire damper. 

• UL Classified for vertical mountings. 



leakage of 8 cfm per sq. ft. at 4.0 inches 









steel. 








plated steel. 










Max. Size 42”w x 48”h (1067mm x 1219mm) 

Notes 



F/S-AF-FA-I (1-1/2 hour) 


Model F/S-AF-FA-I Front Access Combo Fire/Smoke 


Classified Class 1 Leakage 


Combination Fire/Smoke Dampers shall be Model: F/S-AF-FA-I, by Metropolitan Air Technology. 



and have concealed actuator access, from grille side, to allow ‘through the grille’ access to actuators 

and controls. UL 555S rating shall be Class I with leakage not exceed 8 cfm per sq. ft. at 4.0 

inches static pressure for any size. Linkage shall be of the concealed type for maximum free area. 




manufacturer. 


Toll free: 800.585.7686 +1.708.552.4040 



* Wall opening must be oversized by 3/4” (19mm) to 

accommodate thermal blanket thickness. 

Options 





• One Side 






• RCB-1, -2, -3, -4 


• Actuator 




F/S-AF-FA-II (1-1/2 hour) 


Toll free: 800.585.7686 +1.708.552.4040 



Model F/S-AF-FA-II Front Access Combo Fire/Smoke 


Classified Class II Leakage 

Application 

• The F/S-AF-FA-II series Combination Fire/Smoke Dampers have been 



• F/S-AF-FA-II is UL 555 Classified and labeled as a 1-1/2 hour fire damper. 




leakage of 20 cfm per sq. ft. at 4.0 inches static pressure 


*See motor/operator schedule. 







steel. 








plated steel. 











Notes 

Face flange shipped loose if external 


F/S-AF-FA-II (1-1/2 hour) 


Model F/S-AF-FA-II Front Access Combo Fire/Smoke 


Classified Class II Leakage 


Combination Fire/Smoke Dampers shall be Model: F/S-AF-FA-II, by Metropolitan Air Technology. 



and have concealed actuator access, from grille side, to allow ‘through the grille’ access to actuators 

and controls. UL 555S rating shall be Class II with leakage not exceed 20 cfm per sq. ft. at 4.0 

inches static pressure for any size. Linkage shall be of the concealed type for maximum free area. 




manufacturer. 


Toll free: 800.585.7686 +1.708.552.4040 



Options 





• One Side 




• Actuator 






• RCB-1, -2, -3, -4 






manufacturer. 



F/S-3V-CR-I (1 hour) 

Model F/S-3V-CR-I Combo Fire/Smoke Corridor 

Damper UL 555 Classified 1 hour / UL 555S Classified Class I 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The F/S-3V-CR-I series Corridor Fire/Smoke Dampers have been 

designed and tested to exceed all UL, and N.F.P.A. requirements for fire 


• F/S-3V-CR-I is UL 555 Classified and labeled as a fire damper. 

• UL Classified for horizontal mountings. 
















• Linkage: Concealed in frame. Linkage bars are .125 (3.2mm) thick plate 

steel . 

• Controlled Closure Devises: (Heat Activated) 



• Sleeve: 16” (406mm) X 20 Ga, Std. Others available 





dimension, unless otherwise noted. 


Max. Size 24”w x 24”h (610mm x 610mm) 


Corridor Fire/Smoke Dampers shall be Model: F/S-3V-CR-I, by Metropolitan 

Air Technology. Corridor Dampers shall bear the Underwriters’ 

Laboratories label for “Corridor Damper” and have a minimum 1 hour fire 

rating and a minimum Class I leakage rating with a maximum leakage not 

exceed 8 cfm per sq. ft. at 4.0 inches static pressure for any size. Linkage 

shall be of the concealed type for maximum free area. 





downstream. 


Model F/S-3V-CR-I Combo Fire/Smoke Corridor 



Toll free: 800.585.7686 +1.708.552.4040 



F/S-3V-CR-II 

IN SLEEVE 

Options 





• One Side 




• Actuator 






• RCB-1, -2, -3, -4 






manufacturer. 



F/S-3V-CR-II (1 hour) 

Model F/S-3V-CR-II Combo Fire/Smoke Corridor 

Damper UL 555 Classified 1 hour / UL 555S Classified Class II 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The F/S-3V-CR-II series Combination Fire/Smoke Dampers have been 

designed and tested to exceed all UL, and N.F.P.A. requirements for fire 


• F/S-3V-CR-II is UL 555 Classified and labeled as a 1-1/2 hour fire 

damper. 

















• Linkage: Concealed in frame. 

• Linkage bars are .125” (3.2mm) thick plated steel. 




• Sleeve: 16” (406mm) X 20 Ga, Std. Others available 


• Maximum Velocity: 2000 fpm (10.2 m/s) on sizes 



dimension, unless otherwise noted. 




Corridor Fire/Smoke Dampers shall be Model: F/S-3V-CR-II, by Metropolitan 

Air Technology. Corridor Dampers shall bear the Underwriters’ 

Laboratories label for “Corridor Damper” and have a minimum 1 hour fire 

rating and a minimum Class II leakage rating with a maximum leakage not 

exceed 20 cfm per sq. ft. at 4.0 inches static pressure for any size. 

Linkage shall be of the concealed type for maximum free area. 



Model F/S-3V-CR-II Combo Fire/Smoke Corridor 



Toll free: 800.585.7686 +1.708.552.4040 



General Notes: 

This installation instruction applies to Fire/Smoke Dampers (3-V, 

Airfoil, Parallel, Opposed, Single, and Multi-blade types) mounted 

in the plane of an UL approved fire partition. Combination Fire/ 

Smoke dampers are approved for use in Static or Dynamic Systems. 

The dampers are designed for operation in the vertical or horizontal 

position with blades running horizontal. Horizontal installations 

similar to vertical shown. The dampers to be installed square and 

free from twisting or racking. The dampers shall not be compressed 

or stretched into the opening. Transportation and installation of the 

dampers shall be handled with the sleeve or frame. Do not lift the 

damper with the blades or actuator. Special care shall be given to the 

damper before installation and after to insure it is protected against 

dirt weather, mortar and drywall dust, wall texture and paint. Any of 

these conditions could cause the damper not to operate correctly and 

void the warranty. Suitable access to inside duct is to be provided for 

inspection and replacement of parts such as heat response devices 

and actuators per NFPA 90A and local authority having jurisdiction. 

The need to seal the damper in the penetration is not required by Underwriters 

Laboratories. Metropolitan Air Technology dampers have 

been tested and approved to be mounted without the use of sealants 

around the perimeter space between the damper and the penetration. 

As with all joints, contractor must seal duct collar connections in the 

field after installation. MAT Model numbers which are UL approved to 

utilize this installation are F/S-3V-I, (-II), F/S-3V-3-I, (-II), F/S-AF-I, (-II), 

F/S-AF-3-I, (-II), FD-110-3V, FD-160-AF, FDD-110-3V, FDD-160-AF, 

FD-A-3V. 

1. Opening Preparation / Clearances: 


thermal expansion and ease of installation. When steel stud/gypsum 

or wood stud/gypsum partitions are being used then refer to Fig. 1-3 

for additional information and details. 

A. Dampers Assemblies Using 2 Angles Methods (see note 4a) 

shall be a minimum of 1/8” (3mm) per linear foot (305mm) of height 

and width of sleeved assembly up to a maximum of 1-1/2”(38mm) 

and a minimum of 1/4” (6mm). The maximum single section multiblade 

damper is 36” x 48” (914mm x 1219mm) in vertical or horizontal 

mountings. This method is acceptable for 1-1/2 and 3 hour fire dampers. 

See Underwriter’s Laboratories Listings for maximum multiple 

assembly sizes. 

B. Dampers Assemblies Using 1 Angle Methods (see note 4b) shall 

be minimum of 1/8” (3mm) per linear foot (305mm) of height and 

width of sleeved assembly up to a maximum of 1-1/2” (38mm) and a 

minimum of 1/4” (6mm). The maximum single section is the same as 

in A above. The maximum multi-section is 108”w or 108”h up to 36 


Combination Fire/Smoke Dampers 

(Static And Dynamic) Installation Instructions 

square feet. This method is acceptable for 1-1/2 hour fire dampers 

mounted in a masonry/concrete or steel stud/gypsum partitions only. 

C. Dampers Assemblies Using No Angles Methods (see note 4c) 

shall be a minimum of 1/4” (6mm) and a maximum of 1/2” (13mm). 

The maximum single section is the same as in A above. The maximum 

multi-section is 42”w x 48”h. This method is acceptable for 

1-1/2 hour fire dampers mounted in a masonry/concrete or steel stud/ 

gypsum partitions only. 


Sleeves shall be of the SAME GAGE or heavier as the duct to which 


in the SMACNA Fire, Smoke and Radiation damper Guide for HVAC 

Systems (Fig. 4-6) and in NFPA 90A. Gauges shall conform to 

SMACNA or ASRAE duct standards. Sleeves shall not extend beyond 

the fire barrier more than 6” (152mm) unless an actuator or factory 

installed access door is supplied, then the sleeve may extend up 

to 16” (406mm). Sleeve shall terminate at both sides of wall within 


be minimum of 16 gage for dampers up to 36” (914mm) wide by 24” 

(610mm) high and 14 gage for dampers exceeding 36” (914mm) wide 

by 24” (610mm) high. 

Round and oval breakaway connections must use either a 4” 

(102mm) wide draw band or #10 (M5) sheet metal screws spaced 

equally around the circumference of the duct as follows: 3 screws for 

duct sizes 22” (559mm) and smaller; 5 screws for duct sized greater 

than 22” (559mm) and up to and including 36” (914mm): 8 screws for 

duct sizes greater than 36” (914mm). Refer to SMACNA Fire, Smoke 

and Radiation Damper Guide for HVAC Systems for information on 

Ductmate, Nexus, ward, TDC and TDF systems and any additional 

information (Fig. 5-6). A sleeve may not be required if the damper 

frame is of sufficient size and shape so the mounting angles can be 

directly fastened to it. 

3. Multi-Section and “Damper to Sleeve” Connections: 

Damper shall be secured to the sleeve and to each other (when joined 

to make multiple damper assemblies) with #10 sheet metal screws, 

1/4” (6mm) nut and bolts, 1/4” (6mm) tack welds, 3/16” (5mm) steel 

rivets, or clinching (toggle) on 6” (152mm) centers. Both sides of the 

frame are to be secured to the sleeve. When field assembling multisections, 

a continuous 1/8” (3mm) bead of Dow Corning 999, Dow 

Corning Silastic 732, Nuflex 302, or GE RTV 108 Sealant shall be applied 

to the frame joints and where the frame connects to the sleeve. 

Sealant is required only on one side of the damper. Press the surface 

of the sealant in place to dispel any air. 

Fig. 1: Metal Stud/Gypsum Design Fig. 2: Wood Stud/Gypsum Design 

Fire Rating - 2 HR. Fire Rating - 1 HR. Fire Rating - 2 HR. Fire Rating - 1 HR. 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-56a Rev 2 Page 1 of 4


A. Two Angle (Two Sided) Method: 

This method is the oldest and commonly used. This method is approved 

for use in UL approved concrete/masonry partitions, steel 

stud/gypsum partitions, and wood stud/gypsum partitions. In this 

method 2 sets of angles are used to secure the damper in the opening, 

one on each side of the partition (See Fig. 7). Two Angle Method 

is approved for 1-1/2” and 3 hour dampers, vertical or horizontal orientation, 

and any maximum size multi-section UL approved damper 

(see Underwriter’s Laboratories Listings for maximum assembly 

sizes). Angles shall be a minimum of 1-1/2”x 1-1/2” on (37mmx37mm) 

x 16 gauge. Angles are to be fastened to the sleeve on 6” centers 

with #10 (M5) sheet metal screws, 3/16” (5mm) steel pop rivets,1/2” 

(13mm) tack welds, or 1/4” (6mm) diameter nut and bolts with not 

more than 2” (51mm) from each end with a minimum of two connections 

per side/leg. The angles are to overlap the partition a minimum 

of 1” (25mm). These angles may be of a unit type construction and 

may or may not be fastened to each other at the corners. When the 

duct work terminates at the damper or installation prohibits angles 

from turning out/away from the wall, the retaining angle shall be reversed 

(leg turned into the opening) providing the size of the opening 

is increased by an amount equal to twice the combined thickness of 

the angle and the height of the screw or bolt head to maintain expansion 

clearances. See note 1A for information on clearances. See Fig. 


B. One Angle (Single Sided) Method: In this method 1 set of angles 

are used to secure the damper in the opening. This method is approved 

for use in UL approved concrete/masonry partitions and steel 

stud/gypsum walls. Only one side of the fire partition will have the 

angles installed (see Fig. 8). One Angle Method is approved for 1-1/2 

hour dampers only, vertical and horizontal (angles on top side only) 

orientations, and the maximum size shall be 108” wide or 108” high 

up to 36 square feet and up to the maximum multi-section UL approved 

damper size (see Underwriter’s Laboratories Listings for maximum 

assembly sizes). Angle shall be a minimum of 1-1/2” x1-1/2” 

(37mmx37mm) by 16 gauge. Angles are to be fastened to the sleeve 

on 6” centers with #10 (M5) sheet metal screws, 3/16” (5mm) steel 

pop rivets, 1/2” (13mm) tack welds, or 1/4” (6mm) diameter nut and 

bolts with not more than 2” (51mm) from each end with a minimum 

of two connections on each side/leg top and bottom. The angles are 

also to be fastened to the fire partition with: in concrete/masonry 

partitions with #10 (M5) self-tapping concrete anchors or concrete 

screws on 6” (152mm) centers and must engage the fire partition a 

minimum of 1-1/2” (38mm); in steel stud/gypsum partitions secure 

the angles to the partition with #10 (M5) screws long enough to pen- 


Combination Fire/Smoke Dampers Installation 

Instructions (Static And Dynamic) continued 

etrate the J-Runners and E-Stud by a minimum of 3/8” (10mm). Use 

a minimum of two fasteners per side. The angles are to overlap the 

partition a minimum of 1” (25mm). These angles may be of a unit type 

construction and may or may not be fastened to each other at the 

corners. When the duct work terminates at the damper or installation 

prohibits angles from turning out/away from the wall, the retaining 

angle shall be reversed (leg turned into the opening) providing the size 

of the opening is increased by an amount equal to twice the combined 

thickness of the angle and the height of the screw or bolt head 

to maintain expansion clearances. Angles can be placed in front of 

or behind the drywall attaching directly to the steel studs or masonry. 

MAT’s Frame Retaining Angles (ANG) can be used in place of the 

angle mentioned above. See note 1B for information on clearances. 

See Fig. 8 for detailed drawings of installations. 

C. No Angle Method: In this method No angles are used to secure 

the damper in the opening. This method is approved for use in UL 

approved concrete/masonry partitions and steel stud/gypsum walls. 

This method uses a minimum 3/4” (19mm) flange is on one end of the 

sleeve. The damper/sleeve assembly is placed in the opening so that 

the flange rest flush up to the partition, then the fasteners are placed 

through the sleeve into the partition (see Fig. 9). No Angle Method is 

approved for 1-1/2 hour dampers only, vertical and horizontal (flange 

on top side only) orientations, and the maximum size shall be 42” 

(1067mm) wide by 48” (1219mm) high up to the maximum multisection 

UL approved damper size (see Underwriter’s Laboratories 

Listings for maximum assembly sizes). The sleeve flange shall be a 

minimum of 3/4” (19mm) high by 20 gauge steel. If a flange/angle is 

added, it shall be a minimum of 1” x 1” (25mm x 25mm) by 18gauge 

steel and fastened with #10 (M5) bolts or screws, 1/2” (13mm) 

welds, or 3/16” (5mm) rivets to the sleeve, at a maximum spacing 

of 6” (152mm) o.c., not more than 2” (51mm) from each end with a 

minimum of two fasteners per side. The sleeve is to be fastened to 

the fire partition with: in concrete/masonry partitions with #10 selftapping 






side. The sleeve flange can be placed in front of or behind the drywall 





mentioned above. See note 1C for information on clearances. See 

Fig. 9 for detailed drawings of installations. 


5. Actuator Connections: 

Electrical and/or pneumatic connections to damper actuators should 

be made in accordance with wiring and piping diagrams developed 

and in compliance with applicable codes, ordinances and regulations. 

Be sure to check actuator for proper voltage and current draw. Tampering 




Traditional Breakaway Style Transverse Joints Transverse joints illustrated 

at right have always been approved as breakaway connections. 



• Standing “S’ joints can be applied with no. 10 sheet metal screws 

(through joint and duct) subject to the following limitations: Maximum 

2 screws in each side and in bottom joint. 



(508 mm) 


Round or flat oval ducts connected to Type C, CR or CO damper collars 

may use no. 10 sheet metal screws as follows: 

• Ducts to 22” (558 mm) wide (or dia.) and smaller may use 3 screws. 


mm) dia. may use 5 screws. 

• Ducts larger than 36” (914 mm) wide (or dia.) may use 8 screws. 

NOTE: All breakaway connections described may have duct sealant 

applied in accordance with SMACNA recommendations. Such as 

Design Polymerics, DP 1010. 


Flanged connection systems manufactured by Ductmate, 

Ward, and Nexus are approved as breakaway connections 

when installed as illustrated. 






in diagram. 












In addition, fuse links (if provided) shall be removed and 

inspected for corrosion. Dry lubricants are recommended. 


Toll free: 800.585.7686 +1.708.552.4040 



Important General Notes 

This installation instruction applies to Fire Dampers and Combination 

Fire/Smoke Dampers mounted outside the plane of an UL approved 

fire partition. Combination Fire /Smoke Dampers are approved for 

use in Static or Dynamic Systems. The dampers are designed for 

operation in the vertical or horizontal position with blades running 

horizontal. Horizontal installation is similar to vertical shown. The 

dampers are to be installed square and free from twisting or racking. 

The dampers shall not be compressed or stretched into the opening. 

Transportation and installation of the dampers shall be handled with 

the sleeve or frame. Do not lift the damper with the blades or actuator. 

Special care shall be given to the damper before installation and 

after to insure it is protected against dirt, weather, mortar and drywall 

dust, wall texture and paint. Any of these conditions could cause the 

damper not to operate correctly and void the warranty. Suitable access 

to inside duct is to be provided for inspection and replacement 

of parts such as heat response devices and actuators per NFPA 90A 

and local authority having jurisdiction. The need to seal the damper 

in the penetration is not required by Underwriters Laboratories. MAT 

dampers have been tested and approved to be mounted without the 

use of sealants around the perimeter space between the damper and 

the penetration. As with all joints, contractor must seal duct-collar 

connections in the field after installation. These dampers must be ordered 

as an assembly from the factory with the proper MAT insulation 

applied to the dampers. MAT Model numbers which are UL approved 

to utilize this installation are F/S-3V-OW-I, (-II), F/S-AF-OW-I, (-II), 

F/S-3V-FA-I, (-II), F/S-AF-FA-I, (-II), FD-110-3V-OW, FD-160-AF-OW, 

FDD-110-3V-OW, FDD-160-AF-OW, FD-OW, FDD-OW, FD-ASL-OW, 

FDD-ASL-OW. 



thermal expansion and ease of installation. When a steel stud/gypsum 

partition is being used then refer to Figs. 1 and 2 for additional 

information and details. The opening shall be a minimum of 1/4” 


Out Of Wall/Partition Fire Damper & Combo Fire/ 

Smoke Damper Installation Instructions 


Toll free: 800.585.7686 +1.708.552.4040 


(6mm) and a maximum of 1/2” (13mm). The maximum multi-section is 

42”w x 48”h. This method is acceptable for 1-1/2 hour fire dampers 

mounted in a masonry/concrete or steel stud/gypsum wall only. 


Sleeves shall be of the SAME GAUGE or heavier as the duct to which 


in the SMACNA Fire, Smoke and Radiation Damper Guide for HVAC 

Systems (Figs. 3, 4, and 5) and in NFPA 90A. Gauges shall conform 

to SMACNA or ASHRAE duct standards. Sleeves shall not extend 





be a minimum of 16 gage for dampers up to 36” (914mm) wide by 

24” (610mm) high and 14 gage for dampers exceeding 36” (914mm) 

wide by 24” (610mm) high. Round and oval breakaway connections 

must use either a 4” (102mm) wide draw band or #10 (M5) sheet 

metal screws spaced equally around the circumference of the duct as 

follows: 3 screws for duct sizes 22” (559mm) and smaller; 5 screws 

for duct sizes greater than 22” (559mm) and up to and including 36” 

(914mm): 8 screws for duct sizes greater than 36” (914mm). Refer 

to SMACNA Fire, Smoke and Radiation Damper Guide for HVAC 

Systems for information on Ductmate, Nexus, Ward, TDC and TDF 

systems and any additional information (Figs. 4 and 5). A sleeve may 

not be required if the damper frame is of sufficient size and shape so 

the mounting angles can be directly fastened to it. 









A. Grille Mount Method: In this method No angles are used to 

secure the damper in the opening. This method is approved for use 

in UL approved concrete/masonry partitions and steel stud/gypsum 

walls. This method uses a minimum 3/4” (19mm) flange is on one end 

of the sleeve. The damper/sleeve assembly is placed in the opening 

so that the flange rest flush up to the partition, then the fasteners 

are placed through the sleeve into the partition (see Fig. 6). No 

Angle Method is approved for 1-1/2 hour dampers only, vertical and 

horizontal (flange on top side only) orientations, and the maximum 

size shall be 42” (1067mm) wide by 48” (1219mm) high up to the 

maximum multi-section UL approved damper size (see Underwriter’s 

Laboratories Listings for maximum assembly sizes). The sleeve flange 

shall be a minimum of 3/4” (19mm) high by 20 gauge steel. If a flange/ 

angle is added, it shall be a minimum of 1” x 1” (25mm x25mm) by 18 


welds, or 3/16” (5mm) rivets to the sleeve, at a maximum spacing of 

6” (152mm) o.c., not more than 2” (51mm) from each end with a minimum 

of two fasteners per side. The sleeve is to be fastened to the fire 

partition with: in concrete/ masonry partitions with #10 self-tapping 


must engage the fire partition a minimum of 1-1/2” (38mm); in steel 


(M5) screws long enough to penetrate the J-Runners and E-Stud by a 

minimum of 3/8” (10mm). Use a minimum of two fasteners per side. 

The sleeve flange can be placed in front of or behind the drywall 





mentioned above. See note 1 for information on clearances. See Fig. 


B. Continuous Duct Method: In this method 1 set of angles are 

used to secure the damper in the opening. This method is approved 

for use in UL approved concrete/masonry partitions and steel stud/ 



Smoke Damper Installation Instructions continued 

gypsum walls. Only one side of the fire partition will have the angles 

installed (see Fig. 7). One Angle Method is approved for 1-1/2 hour 

dampers only, vertical and horizontal (angles on top side only) orientations, 

and the maximum size shall be 42” wide x 48” high and up to 

the maximum multi-section UL approved damper size (see Underwriter’s 

Laboratories Listings for maximum assembly sizes). Angle 

shall be a minimum of 1-1/2” x 1-1/2” (37mm x 37mm) by 16 gauge. 

Angles are to be fastened to the sleeve on 6” centers with #10 (M5) 

sheet metal screws, 3/16” (5mm) steel pop rivets, 1/2” (13mm) tackwelds, 

or 1/4” (6mm) diameter nut and bolts with not more than 2” 

(51mm) from each end with a minimum of two connections on each 

side/leg top and bottom. The angles are also to be fastened to the fire 

partition with: in concrete/masonry partitions with #10 (M5) self-tapping 


must engage the fire partition a minimum of 1-1/2” (38mm); in steel 


(M5) screws long enough to penetrate the J-Runners and E-Stud 


side. The angles are to overlap the partition a minimum of 1” (25mm). 

These angles may be of a unit type construction and may or may not 

be fastened to each other at the corners. When the duct work terminates 

at the damper or installation prohibits angles from turning out 

away from the wall, the retaining angle shall be reversed (leg turned 

into the opening) providing the size of the opening is increased by an 

amount equal to twice the combined thickness of the angle and the 

height of the screw or bolt head to maintain expansion clearances. 

Angles can be placed in front of or behind the drywall attaching 

directly to the steel studs or masonry. MAT’s Frame Retaining Angles 

(ANG) can be used in place of the angle mentioned above. See note 

1 for information on clearances. See Fig. 7 for detailed drawings of 

installations. Actuator Connections (if applicable): Electrical and/or 

pneumatic connections to damper actuators (if provided) should be 

made in accordance with wiring and piping diagrams developed in 

compliance with applicable codes, ordinances and regulations. Be 

sure to check actuator for proper voltage and current draw. Tampering 




Toll free: 800.585.7686 +1.708.552.4040 







Note: All breakaway connections described may have duct sealant applied n accordance with SMACNA recommendations. Such as Design Polymerics. 

DP1010. 






Toll free: 800.585.7686 +1.708.552.4040 



1. 18 gauge galvanized steel integral sleeve shall be of the SAME 

GAUGE or heavier as the duct to which it is attached. Gauges shall 

conform to SMACNA or ASHRAE duct standards. The length of the 

sleeve extending beyond the wall opening shall not exceed 16” (406 

mm) on the operator side or 6” (152mm) on the opposite side. 

2. The connecting duct shall terminate at the integral sleeve and is 

connected by using either: 

• A. a minimum of 3 - #10 sheet metal screws spaced equidistant 

around the sleeve for 22” and smaller duct. 

• B. a minimum of 5 - #10 sheet metal screws spaced equidistant 

around the sleeve for greater than 22” duct. 

• C. a 4” (101mm) drawband. 

3.Clearance between the damper sleeve and the round or square wall 

opening shall be a minimum of 1/2” (13 mm) and a maximum of 1” 

(25 mm). 

4. Damper will be factory supplied with one retaining plate secured to 

the damper sleeve on the operator side of the damper. 

5. A minimum of 4 equally spaced 20 gauge galvanized steel clip 

angles shall be attached to both the integral sleeve and the retaining 

plate. The clip angles shall be attached with 1/8” (3.2mm) rivets, #10 

x 1/2” (12.7mm) steel metal screws, bolts or welds. In metal stud/ 

OPTION 1: ANGLES 2 SIDES 


(Refer to Metal or Wood Stud Framing For 

Fire Dampers In Drywall Partitions) 

OPTION 1 

UL APPROVED WALL 

OR FLOOR DESIGN 


Model F/S-RD Combo Fire/Smoke Damper 



Toll free: 800.585.7686 +1.708.552.4040 


gypsum applications, the retaining plate may be in front of or behind 

the gypsum, directly against the metal studs. 

6. Option 1: The damper may be installed in a wood/gypsum, steel 

stud/gypsum, or masonry fire partition in the vertical or horizontal 

position (blade shaft running horizontal) with a retaining plate flush 

against each side of the fire partition. Installation: with the factory installed 

retaining plate flush to the fire partition, place another retaining 

plate on the opposite side of the damper sleeve and slide it forward 

until it becomes flush with the opposite side of the partition. Place the 

Splice Clip over the cut portion of the retaining plate. Secure it with 

4 - #10 sheet metal screws or rivets. Secure the clip angles to the 

retaining plate and damper sleeve as illustrated. 

Important 

• Do Not Cast Damper In Place 

• Cycle Damper After Installation To Insure Free Movement 

• Do Not Install Damper Out Of Round 

Note 

Caution heavy spring used to load spring/link actuator use care in 

resetting link. 

All dimensions 

in inches 

A and B = 

Damper Dia. plus 3” (76 mm) 

Cut (Cover with 

Splice Clip) 

D 

2 

Retaining Plate Detail 




Model F/S-RD Combo Fire/Smoke Damper 

Installation Instructions continued 

6B. Option 2: The damper may also be installed in a steel stud gypsum, 

or masonry partition, in a vertical or horizontal (retaining plate on 

top) position (blade running horizontal), with a retaining plate on one 

side of the partition. Installation: with the factory installed retaining 

plate flush to the fire partition, place 8 screws (#10 sheet metal for 

steel studs long enough to penetrate the metal stud by 1/2” minimum 

or #10 x 1-1/4” masonry screws) equidistant around the perimeter 

of the retaining plate. Screws are placed in each corner and halfway 

between the corners as shown. 

7. Electrical and/or pneumatic connections to damper actuators 

should be made in accordance with wiring and piping diagrams 

developed in compliance with applicable codes, ordinances and 

regulations. 

8. Refer to the installation instruction for Drywall Type Construction 

for the material and opening framing details. 


OPTION 2: ANGLE 1 SIDE 


(Refer to Metal or Wood Stud Framing For 

Fire Dampers In Drywall Partitions) 


9. As with all joints, the contractor must seal duct-collar connections, 

in the field, after installation. 







This installation sheet has been reviewed and accepted by Underwriters 

Laboratories 


Toll free: 800.585.7686 +1.708.552.4040 



Installation Instruction For Corridor Dampers 

These Installation instructions apply to tunnel corridor dampers installed 

in 1 hour rated drywall fire separations. Specific requirements 

in these instructions are mandatory. These instructions meet the 

requirements of UL 555 and UL 555S. 

1. Clearance Required Between Damper Sleeve And Openings: 

Damper and sleeve assemblies expand during periods of intense 

heat. Therefore it is essential that the openings be larger than the 

damper and sleeve assembly to allow for expansion. Clearance 

required between the outside of the damper/sleeve assembly and the 

opening in the fire separation is a minimum clearance of 1/4”. This is 

a total clearance and does not need to be equally spaced around the 

damper/sleeve assembly. 

2. Sleeve Length: The damper must be installed in a sleeve. The 

sleeve must be long enough to permit proper support of the damper 

and offset drive shaft and also permit appropriate securing of 

perimeter angles. The minimum sleeve length is 16”. (A 16” sleeve 

should be appropriate for separations up to and including 6” in depth 

when the sleeve is flush with the underside of the fire separation. For 

separation deeper, add one inch of sleeve length for each additional 

inch, over 6”, of separation depth). If the sleeve is mounted below the 

separation, the distance below the separation should be added to the 

sleeve length. 

3. Securing The Damper To The Sleeve: Dampers must be secured to 

the sleeve with No. 10 sheet metal screws, 1/4” bolts and nuts, welding 

(1/2” long minimum), 3/16” diameter pop rivets, or 3/16” diameter 

toggle lock, 6” on center, 2” maximum from the corners. The damper 

must be installed in the sleeve so that the backside (non-drive shaft 

side) is a minimum of 1/2” from the edge of the sleeve. This permits 

clearance to allow for caulking around the edge of the damper frame 

should it be required. 

4. Securing The Damper/Sleeve Assembly To The Separation Opening: 

The damper/sleeve assembly should be installed in the separation 

opening using retaining angles on both sides of the opening. The 

retaining angles should be made from a minimum of 16 gauge steel. 

The bottom angle should be 8” long and be 3/4” by 1-1/2” -see 


Model F/S-3V-CR-I (-II) Corridor Damper 




Toll free: 800.585.7686 +1.708.552.4040 


details on drawing below. The fasteners should be located as indicated 

on drawing below. The bottom angle should be located such 

that the center of the angles lines up with the center of the damper 

sleeve on each side. The perimeter angles on the top of the assembly 

should be the same length as the damper width or height and should 

have one leg 3/4” long and the other leg must be long enough to 

allow the fasteners to be attached to the sleeve and NOT interfere 

or damage the damper or the internal linkage so as to interfere with 

the closing capabilities of the damper. To determine the height of 

the perimeter angle leg, dimension A on drawing below, follow the 

instructions below: 

A. Damper/Sleeve Assembly is Mounted Flush with the Underside 

of the Fire Separation - Take the distance from the back edge of the 

damper frame to the edge of the damper sleeve, dimension B, (see 

drawing below), add 5-1/2” and subtract the depth of the fire separation, 

dimension C. Note: the minimum height of the perimeter angle 

is 1-1/2”. Therefore, for a damper installed 1” from the edge of the 

damper sleeve and in a 4” deep fire separation, the height of the upper 

perimeter leg should be 2-1/2”. 

B. Damper/Sleeve Assembly is Mounted Below the Underside of 

the Fire Separation - Take the distance from the back edge of the 

damper frame to the edge of the damper sleeve, dimension B, (see 

drawing below), subtract the distance that the sleeve protrudes below 

the fire separation, add 5-1/2” and subtract the depth of the fire separation, 

dimension C. Note: the minimum height of the perimeter angle 

must be 1-1/2”. Therefore, for a damper installed 1” from the edge of 

the damper sleeve, protruding 1” below a 4” deep fire separation, the 

height of the upper perimeter leg should be 1-1/2”. Perimeter angles 

should be attached to the sleeve using No. 10 sheet metal screws, 

1/4” bolts and nuts, welding (1/2” long minimum), 3/16”diameter pop 

rivets, or 3/16” diameter toggle lock, 6” on center, 2” maximum from 

the corners. 









Damper and sleeve assemblies 16 ga. 1-1/2” x 1-1/2” (38mm x 

38mm) Formed Galvanized Steel with staked corners. 

Sizes 

Maximum and minimum sizes correspond to the individual damper 

model. Check the appropriate submittal sheet or size chart. 

Application 

MAT Model ANG Framed Retaining Angles may be used instead of 

the normal mounting angles being used at present. The model ANG 

retaining angles can be installed on MAT curtain fire dampers, multibladed 

fire dampers and combination fire/smoke dampers with 1-1/2 

hr. or 3 hr. vertical or horizontal fire ratings. ANG angles are factory 

supplied two per damper. 

Model ANG Framed Retaining Angles can be used in the single angle 

mounting method described in the installation instructions. 


Model ANG Framed Retaining Angles For 

UL Fire Dampers Installation Instructions 


Installation 

1. Install damper within fire separation as detailed in the appropriate 

damper installation instruction sheet. Omit the normal perimeter 

angles. 

2. Place the model ANG angle around the damper sleeve on both 

sides of the fire separation as shown below. 

3. The ANG angles must be attached to the sleeve with No. 10 sheet 

metal screws, tack or spot welds, 1/4” (6.4 MM) bolts and nuts, or 

3/16” (4.8 mm) steel pop rivets. 

The fasteners must be spaced 6” (152.4 mm) on centers and be a 

maximum of 2” (50.8 mm) from the corners. 

A minimum of two fasteners are required on each top, bottom or side 

of the damper sleeve. 


Toll free: 800.585.7686 +1.708.552.4040 



In today’s life safety products markets, many building codes require 

fire dampers, smoke dampers and combination fire and smoke 

dampers to be inspected for proper operation. Many of these codes 

require that the damper be inspected and cycled every 12 months 

to 4 years depending on the local authority and the type of system 

in which it is installed. Metropolitan Air Technology’s STO/R option 

provides the ease of operating and resetting the damper in a matter 

of seconds without replacing the link. The EFL is used in lieu of a 

conventional fusible link. It is a reusable/resettable heat responsive 

device that can only be reset after a visual inspection of the damper. 

Dampers which allow remote resetting of the heat response device 

from a remote location are dangerous. A remotely reset damper may 

not be fully functional and should be visually inspected. The STO/R 

is reset from the outside of the damper sleeve, therefore requiring 

a visual inspection of the damper. By depressing a button on the 

outside of the sleeve an inspector can verify if the damper is fully 

operational. The EFL is a multi-use heat responsive device. It is wired 


Model STO/R (Single Thermostat Operator Release) 

For Combo Fire/Smoke Dampers & Motorized Multi-Blade Fire Dampers 

in series with the actuator therefore it is user friendly in most applications. 

When the smoke detector interrupts the current to the damper, 

the EFL will not hinder the closing of the damper. The STO/R package 

includes blade indicator switches which allow for remote notification 

of damper blade position, as a standard feature. The STO/R option 

is available on all MAT F/S Model Combination Fire/Smoke Dampers 

and Motorized Multi-Blade Fire Dampers, refer to pages 3 and 4 for 

the Siemens GND Series actuator. The below details do not apply to 

the GND Series. 







Devices to Left of dashed line are located Devices to right of dashed line are factory 

remotely from damper - furnished by others. mounted on damper. 

Switch is in Normal (Damper Open) Position: 

Damper motor is energized until thermostat senses temperture above initial 

closure rating. Above termperature closure rating, the damper 

motor is de-energized and damper closes. 

Smoke Detector (if used) wired in series with temperature sensitive device. 

Switch in Closed Posistion damper motor is de-energized and damper is closed. 

Detailed wiring diagrams including terminal designation and/or wire color coding 

6235 South furnished Oak Park with each Avenue shipment. Chicago, IL 60638 USA Represented by: 

Toll free: 800.585.7686 +1.708.552.4040 


Indicator Switch Electrical Limitations 

• 10 Amperes, 1/4 HP, 120 or 240 Volts A.C. 

• .5 Ampere, 125 Volts D.C. 


• 5 Amperes, 120 Volts (Lamp Load) 

• 15 Amperes, 24 Volts D.C. 




For Combo Fire/Smoke Dampers & Motorized Multi-Blade Fire Dampers continued 

See pages 3 and 4 for Siemans GND Actuator. 


Toll free: 800.585.7686 +1.708.552.4040 


P-61b Rev 1 Page 2 of 6 © 2012 Metropolitan Air Technology. All rights reserved. 7/12

The Thermostat is wired to the actuator via a low voltage (24 vac) 

connection. In most cases codes does not require this wiring to be 

incased. Check with your local codes to see if low voltage wires 

requires conduit. Notify MAT if conduit is required. 

Note 

Both sets of auxiliary switch contacts are open when actuator is 

between 5 degrees and 85 degrees. 




L3, L4 is a Supply Voltage Compatible with Lights and Switches. Standard Voltage is Same 

as Actuator Ordered. 

Ratings: 

250 vac - 10 amps 

Motor Load - 3 amps 

Max. Temperature - 350 o F (177 o C) 


Toll free: 800.585.7686 +1.708.552.4040 






Heat Response Device 

(Inside Ductwork) 

Plug must be clipped in 

for actuator to operate. 

4-Wires 

Auxiliary Switches 

Gray & Yellow 


Reset Button 

Housing 

(Outside Ductwork) 


Toll free: 800.585.7686 +1.708.552.4040 


24 vac connection to heat 

Response Device. Must be 

plugged in for actuator to 

operate. (2 Wires) 

3-Wires 

Power Supply 

(See Voltage page 3) 

Actuator is rated for internal or external mounting. 





L1, L2 is the E-P Switch Supply Voltage 

desired (120vac or 24vac). L3, L4 is a 

Supply Voltage Compatible with Lights 

and Switches. Standard Voltage is 120vac 

if not Specified. 


Toll free: 800.585.7686 +1.708.552.4040 


Pneumatic actuator w/ E-P Switch 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-61e Page 5 of 6 

* 

*EFL 

TSI




Pneumatic actuator w/ PFL 


Toll free: 800.585.7686 +1.708.552.4040 


PFL 

L3, L4 is a Supply Voltage Compatible 

with Lights and Switches. Standard 

Voltage is 120vac if not Specified. 

P-61f Page 6 of 6 © 2012 Metropolitan Air Technology. All rights reserved. 7/12

Prior to today’s advancements in smoke control techniques, fan 

systems were required to shut down during fire conditions and fire 

dampers were closed by heat. Air pressures were not utilized for 

the control and containment of smoke. In recent years, the requirement 

that systems completely shut down and fire dampers close and 

remain closed during fire conditions, has been questioned. With the 

current Combination fire/smoke dampers may need to operate at 

temperatures above and beyond their initial closure rating. Metropolitan 

Air Technology’s DTO/R option provides the capability to override 

rated damper closure from a secure remote location (such as a fire 

fighter’s smoke control command of a remotely located control to 

permit utilization of the HVAC/Engineered Smoke Control System, but 

only until such time as the fire conditions exceed the maximum design 

limit. The DTO/R options also permits a combination fire/smoke 

damper to be reopened after afire emergency has been controlled 


Model DTO/R (Double Thermostat Override Release) 

For Combination Fire / Smoke Dampers 

Orange 

Smoke 

Detector 

(If used) 

Switch is in Normal (Open) Position damper motor is energized until thermostat 

senses temperature above initial closure rating. Above temperature closure rating, 

the damper motor is de-energized and damper closes. 

Switch may then be moved to the Override Position and the damper will reopen and 

remain open until maximum operating temperature is reached. Once this temperature 

has been reached the damper motor is de-energized and the damper closes. 

Switch in Closed Position damper motor is de-energized and damper is closed. 

Detailed wiring diagrams including terminal designation and/or wire color coding 

furnished with each shipment. 


Toll free: 800.585.7686 +1.708.552.4040 


Black 

providing the temperatures at the damper have cooled down below 

the maximum design limit. Please note that the DTO/R option is 

recommended only for use in systems utilizing an Engineered Smoke 

Control design. 

The DTO/R option is available on all Metropolitan Air Technology’s 

F/S Model Combination Fire/Smoke Dampers. 







Smoke detector may be field or factory supplied 







© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-62 Rev 2 Page 1 of 2


Model DTO/R (Double Thermostat Override Release) 

For Combination Fire / Smoke Dampers continued 

DTO/R Wiring Details 

L3, L4 is a Supply Voltage Compatible with Lights and Switches. Standard Voltage is 

Same as Actuator Ordered. 

Black 

Black 

TS1 TS2 


Orange 

Orange 


Toll free: 800.585.7686 +1.708.552.4040 


P-62b Page 2 of 2 © 2012 Metropolitan Air Technology. All rights reserved. 7/12 

Blue

In today’s life safety products markets, many building codes require 

fire dampers, smoke dampers and combination fire and smoke dampers 

to be inspected for proper operation. Many of these codes require 

that the damper be inspected and cycled every 6 months to a year 

depending on the local authority and the type of system in which it 

is installed. Metropolitan Air Technology’s EFL option provides the 

ease of operating and resetting the damper in a matter of seconds 

without replacing the damper. Dampers which allow remote resetting 

of the damper from a remote location are dangerous. A remotely reset 

damper may not be fully functional and should be visually inspected. 

The EFL is reset from the outside of the damper sleeve, when the 

actuator is externally mounted, therefore requiring a visual inspection 

of the damper. By depressing a button on the outside of the sleeve 

and inspector can verify if the damper is fully operational. The EFL 

is a multi-use heat responsive device. It is wired in series with the 

smoke detector therefore it is user friendly in most applications. When 

the smoke detector interrupts the current to the damper, the EFL will 

not hinder the closing of the damper. 


Model EFL (Electric Fuse Link) 

For Combination Fire/Smoke Dampers & Motorized Multi-Blade Fire Dampers 

Black 

F/S DAMPER EFL OPERATION 

Switch is in Normal (Damper Open) Position: Damper motor is energized until 

thermostat senses temperature above initial closure rating. Above temperature 

closure rating, the damper motor is de-energized and damper closes. 

Smoke Detector (if used) wired in series with temperature sensitive device. Switch 

in Closed Position damper motor is de-energized and damper is closed. Detailed 

wiring diagrams including terminal designation and/or wire color 

coding furnished with each shipment. 

The EFL is standard on all Metropolitan Air Technology F/S Model 

dampers and Motorized Multi-Blade Fire Dampers. The EFL comes in 

temperatures of 165°F, 212°F, 250°F and 350°F (depending on actuator 

selected). (The below details do not apply to the Siemens GND 

Series - Refer to Pages B-24c & B-24d) 

UL 555S Classified at 250 °F or 350 °F depending upon motor/operator 








Smoke Detector 

(If used) 


Toll free: 800.585.7686 +1.708.552.4040 


Thermostat Switch Electrical Limitations 

•15 Ampere, 120 Volts A.C. 

•15 Ampere, 24 Volts A.C. 

•12.5 Ampere, 250 Volts A.C. 


UL 555S Classified at 250 °F or 350 °F depending upon 

motor/operator *see motor/operator schedule 


Model EFL (Electric Fuse Link) continued 


Black 

Blk. 


Toll free: 800.585.7686 +1.708.552.4040 









Toll free: 800.585.7686 +1.708.552.4040 


© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-63c Rev 2








Toll free: 800.585.7686 +1.708.552.4040 


P-63d Rev 2 © 2012 Metropolitan Air Technology. All rights reserved. 7/12



PFL 

Model PFL Pneumatic Fuse Link 

For combination fire/smoke dampers and motorized multi-blade fire dampers 


Toll free: 800.585.7686 +1.708.552.4040 


Pneumatic Actuator with a PFL Option 

The PFL option has several features that make it a good 

choice as a must on your job. First it does not require 

electric power to be at the damper’s location. An E-P 

switch is not required on a pneumatically actuated 

damper which has this option. When the link melts, the 

pneumatic power does not have to be shut off for the 

damper to close. The PFL costs less and has fewer parts 

to maintain than an E-P switch. Another feature is that the 

link can be easily removed and the damper inspected for 

operation under airflow conditions. By using the PFL over 

conventional fuse links, the HVAC system can be systematically 

control closed to prevent any duct implosion 

problems. Fusible links are available at 165°F and 212°F 

temperatures. 





Model M/S Micro Switch Package 

For combination fire/smoke dampers 

The M/S Switch Package provides the ability to remotely indicate 

the damper blade position. It is two integrally mounted 

micro switches for positive status indictions. Electrical interface 

with a remote control on/off fan station is also possible 

with the M/S package. 

The M/S Switch Package consist of the switch box, containing 

two damper position indicator switches (one closes when 

the damper is fully open and the other closes when the damper 

is fully closed), a switch box mounting bracket, a blade 

bracket, and hardware necessary to directly link the switch 

box to the blade. The M/S option is available on all MAT 

Manufacturing F/S Model Combination Fire/Smoke Dampers, 

SSD Model Smoke dampers, and FD-110, FD-160 Model 

Multi-blade dampers. 

Position indicator switch (closes 

when damper is closed) 

Detailed wiring diagrams including terminal designation and/or wire color coding furnished with each shipment. 


Built-in Actuator Switch Packs 

Many of the newer application specific actuators designed 

for use on fire/smoke dampers feature “add-on” component 

position indicator switches manufactured and UL tested by 

the actuator manufacturer. Honeywell ML4115/ML8115 and 

MS4X09/MS8X09 actuators are examples. 

Some actuator models have variants with position indicator 

switches built right in to the actuator. Honeywell MS4120F/ 

MS8120F and Belimo FSNF24S/FSNF120S actuators are 

examples. 

When ordered with the M/S Package combination fire/smoke 

and smoke dampers that utilize these actuators will usually 

be supplied with the actuator mounted switch pack, factory 

installed as required by UL. 

Electric damper actuator or 

electric/pneumatic solenoid 

valve (power on opens damper, 

power off closes damper). 






Position indicator switch • 15 Amperes, 24 Volts D.C. 

(closes when damper is open) 


Toll free: 800.585.7686 +1.708.552.4040 



In today’s real world of budget cut backs and lack of time to periodically 

check damper operation, MAT is pleased to introduce this labor 

saving option. MAT, Model RCB-X, Remote Control Boxes are for use 

on dampers where it is desired to note dampers operation without 

the necessity of shutting the HVAC system down. NFPA, local and 

national codes state that fire and smoke dampers shall be checked 

periodically for operation. Most actuator manufacturer’s recommend 

their actuators be cycled every 6 - 12 months, to insure proper operation 

of the damper/actuator. This unit can be installed in the wall 

below the damper, a central location, mounted in the ceiling below 

the damper, or on the duct connected to the damper. When properly 

installed the building maintenance department can save as much as 

70% time in locating and checking damper operation. With a simple 

flip of the switch and watching the lights gives you the assurance 

that the damper is properly working without the need for shutting the 

HVAC system down, removing ceiling tiles, removing duct access 

doors, and using a ladder and flash light to look down the duct to see 

if the damper is closed or open. See Control Switch Functions below. 

Model RCB-1: 

The RCB-1 is a single electrical box panel that is composed of an On/ 

Off switch, one red and one green light. This model can be used in 

conjunction with any of our combination fire/smoke dampers, smoke 

dampers, multi-blade fire dampers, and air control dampers with the 

proper options. The dampers must be ordered with one of the following 

options: M/S, STO/R, or DTO/R. 

Model RCB-2: 


Off/On switch, one red and one green light. This model can be used 

in conjunction with our combination fire/smoke dampers that are ordered 

with options DTO/R. This model, when wired properly, will allow 

for bypassing the lower thermostatic disk (usually 165°F or 212°F). 

While in Bypass mode, the damper will remain open until the upper 

limit thermostatic disk activates (usually 250°F or 350°F depending 

on what is ordered). 

Model RCB-3: 

The RCB-3 is a single electrical box panel that is composed of a red 

and green light. This model can be used in conjunction with any of 

our combination fire/smoke dampers, smoke dampers, multi-blade 

fire dampers, and air control dampers with the proper options. The 

dampers must be ordered with one of the following options: M/S, 

STO/R, or DTO/R. This model only incorporates lights for visual observation 

of the dampers’ blade position. 


Model RCB-1, RCB-2, RCB-3, RCB-4 (Remote 

Control Box) For Multi-Blade Dampers 


Toll free: 800.585.7686 +1.708.552.4040 


Model RCB-4: 

The RCB-4 is a RCB-1 or RCB-2 box that has a Keyed switch for 

security controlled operation or inspection of dampers. The switch 

only controls the operation of the damper. The operation of the lights 

is independent of the switch position. Refer to RCB-1 or RCB-2 for 

more details on the specific box. 

Control Switch Functions: 

Normal/Open: Switch in this position allows the damper to operate 

as if it was wired directly to a smoke detector or other power source. 

The damper remains open until the power source is disconnected 

from a smoke detector signal, fan interlock, etc or until the temperature 

in the duct elevates above the heat responsive device located on 

the damper. 

Closed: 

Switch in this position, disconnects power to the actuator, thus allowing 

the damper to close. It will remain closed until the switch is positioned 

into the normal/open position regardless of any input signals. 

This wording is only used on RCB-1 only. 

Off: 


the damper to close. It will remain closed until the switch is 

positioned into the normal/open position regardless of any input 

signals. This wording is only used on RCB-2 only when used in conjunction 

with a DTO/R option. 

By-pass: 

Switch in this position, the operator is allowed to by-pass the low 

temperature thermostat, thus opening the damper until the air in the 

duct elevates to high temperature thermostat limit. At this time the 

damper will close and cannot be re-opened. 

Green Light (Open): 

This light is wired in series with the micro-switch package and indicates 

when the blades are open. Standard ratings for this light are 

120vac. 24 vac and Direct Current (vdc) lights will need voltage noted 

on order and ordered special. 

Red Light (Closed): 


when the blades are closed. Standard ratings for this light are 




Note 

• Remote Control Boxes are standardly shipped loose from damper 

for field wiring and desired placement. Choose the wiring diagram 

below with the correct option (standard/fusible link, STO/R, or 

DTO/R) ordered for proper wiring details. 

• Boxes are standardly shipped with 120vac lights. Special and 

indicate on order 24vac or vdc lights if needed. 



Control Box) For Multi-Blade Dampers continued 


• Wires indicated are for M/S Package mounted on the right hand 

side of the damper. If the M/S package is on the left hand side, 

then the open/close wires will need to be switched. 


Toll free: 800.585.7686 +1.708.552.4040 


Blk. 

P-66b Rev 3 Page 2 of 2 © 2012 Metropolitan Air Technology. All rights reserved. 7/12 

Orange 

Blue 

Blk.


Motor/Actuators UL Listed Products Fire Dampers 

& Combination Fire & Smoke Dampers 

OPERATORS 

Manufacturer Model 

250˚F/ 121˚C Rated Actuators 

Reference Chart 

Mounting 

Power 

Supply 

Maximum Damper Size and Static Pressure 

F/S-3V and S-3V F/S-AF and S-AF 

Max. Velocity 2000 FPM 

Pressure 4.0” w.g. 



Pneumatic - 25 psi WIDTH or HEIGHT, SQ FT LIMITATIONS PER ACTUATOR 

Siemens #4, 331-2961 External 25 psi 

6 sq. ft., 36"w, 48"h 

12 sq. ft., 36"w, 48"h 

6 sq. ft., 36"w, 48"h 

12 sq. ft., 36"w, 48"h 

24 VAC - ELECTRIC WIDTH or HEIGHT, SQ FT LIMITATIONS PER ACTUATOR 

Belimo FSLF-24 Internal / External 24 vac 36” w or 48” h, 4 sq. ft. 36” w or 48” h, 4 sq. ft. 

Siemens GND-121 Internal / External 24vac 36” w or 48” h, 4 sq. ft 36” w or 48” h, 4 sq. ft 

Honewell ML-8115 External 24 vac 36” w or 48” h, 6 sq. ft n/a 

Siemens GGD-121 External 24 vac 36” w or 48” h, 9 sq. ft. n/a 

Belimo FSNF-24 External 24 vac 36” w or 48” h, 12 sq. ft. n/a 

Honeywell MS-8120F External 24 vac 36” w or 48” h, 12 sq. ft. 36” w or 48” h, 12 sq. ft. 


Belimo FSLF-120 Internal / External 120 vac 36” w or 48” h, 4sq. ft. 36” w or 48” h, 4 sq. ft. 

Siemens GND-221 Internal / External 120 vac 36” w or 48” h, 4 sq. ft. 36” w or 48” h, 4 sq. ft. 

Honeywell ML-4115 External 120 vac 36” w or 48” h, 6 sq. ft. n/a 







Honeywell ML-4115C/D External 120 vac 36” w or 48” h, 6 sq. ft. n/a 




Belimo All Models 

Accessories 

Auxillary Switches (SPDT) 

Honeywell ML-Series Auxiliary Switches (SPDT) 

Siemens X26.1U Auxiliary Switches (SPDT); x=1 for 24Vac, 2 for 120Vac, or 3 for 230Vac 

Siemens EFL Electric Thermal Link for GND Series Actuators 

Siemens 147-2000 Pneumatic Positioner 

* Consult Factory for actuator and damper sizes for velocities up to 4000 fpm and pressures up to 6” w.g. 

Honeywell MS-4120, MS-4620 and MS-8120 Series actuators (250°only) are available for dampers up to 

36 x 36 single section, damper models FS-AF, S-AF, FDD-AF, FD-AF only. 


Toll free: 800.585.7686 +1.708.552.4040 




Motor/Actuators UL Listed Products Fire Dampers 

& Combination Fire & Smoke Dampers 

OPERATORS 




*Consult Factory for additional actuator and damper sizes on velocities up to 4000 FPM and 6” w.g. 

Other Actuator UL Approved: Honeywell MS-8209, 4209, 4709, 4309, 4809, 8309 

Mounting 

Power 

Supply 



F/S-3V and S-3V F/S-AF and S-AF F/S-RD, S-RD 

Max. Velocity 2000 FPM Max. Velocity 2000 FPM Max. 



Dia. 


Siemens #4, 331-2961 Internal / External 25 PSI 

36” w or 48” h, 9 sq. ft. - Class 1 



36” w or 48” h, 12 sq. ft.- Class 2 

24” 

24” 


Belimo FSLF-24 Internal / External 24 vac 36” w or 48” h, 4 sq. ft. 36” w or 48” h, 4 sq. ft. 18” 

Siemens GND-121 Internal / External 24 vac 36” w or 48” h, 4 sq. ft. 36” w or 48” h, 4 sq. ft. 18” 

Honeywell ML-8115 External 24 vac 36” w or 48” h, 6 sq. ft. n/a 24” 

Siemens GGD-121 External 24 vac 36” w or 48” h, 9 sq. ft. n/a 24” 

Belimo FSNF-24 External 24 vac 36” w or 48” h, 12 sq. ft. n/a 24” 

Honeywell ML-8120F* External 24 vac 36” w or 48” h, 12 sq. ft. 36” w or 48” h, 12 sq. ft. 24” 







Honeywell MS-4120F External 120 vac 36” w or 48” h, 12 sq. ft. 36” w or 48” h, 12 sq. ft. 24” 




Honeywell ML-4115C/D External 120 vac 36” w or 48” h, 6 sq. ft. n/a 24” 





Accessories 

Auxiliary Switches (SPDT) 





* Consult Factory for actuator and damper sizes for velocities up to 4000 fpm and pressures up to 6” w.g. 

Honeywell MS-4120, MS-4620 and MS-8120 Series actuators (250°only) are available for dampers up to 

36 x 36 single section, damper models FS-AF, S-AF, FDD-AF, FD-AF only. 


Toll free: 800.585.7686 +1.708.552.4040 



P-68

P-68a Page

P-68b Page 1

P-68b Page 2

P-68c Page 1

P-68c Page 2

Note: Only if required by the authority having jurisdiction 

Application 

The need to seal the damper in the penetration is not required by 

Underwriters Laboratories. MAT dampers have been tested and approved 

to be mounted without the use of sealants around the perimeter 

space between the damper and the penetration. In certain cases, 

local codes request that this space be sealed to try and keep the 

integrity of the smoke barrier. These instructions have been produced 

to give direction where to apply caulk, if required by local codes. Suggested 

brands of caulk to use are Dow Corning 999, Dow Corning Silastic 

732, Nuflex 302 and GE RTV 108 Sealant. Read and follow the 

sealant manufacturer’s directions. Apply a continuous bead of caulk 

in the areas shown below. Do Not Apply sealant within the required 

expansion gap between the damper and the fire rated wall or floor. 

Allow the sealant to set up and become tack-free before operating 

the damper. See MAT’s standard installation instructions for the basic 

installation of the damper. These instructions are for use following 

damper installation. Permission from the local codes inspector should 

be acquired before use of these instructions, to insure conformity with 

the local codes. 

Procedure 

1. Follow MAT’s standard/general installation instructions for proper 

installation of the damper in the wall/floor. 

2. Clean all areas where the sealant is going to be applied. Remove 

(1) Fire and smoke rated wall or floor 

(2) Retaining Angles 

(3) Fire, Smoke or Combination Fire/Smoke damper 

(4) Sleeve 

(5) Fasteners 

(6) Sealant to Wall 

(7) Sealant to Sleeve 


Optional Sealing Of Dampers In Fire/Smoke Rated 

Walls Or Floor Openings Installation Instructions 



Toll free: 800.585.7686 +1.708.552.4040 


dirt, oil, grease, or moisture from surface to be sealed. Allow to dry 

thoroughly. 

3. Using G.E. RTV 108, Dow Corning Silastic 732 RTV, Nuflex 302 or 

Dow Corning 999 Silicone Caulk, apply a continuous bead around 

the outside perimeter of the retaining angle, sealing them to the 

firewall/floor (6). Do not apply caulk between angle and wall/floor. 

Also apply a continuous bead between the retaining angle and the 

damper sleeve(7). Be sure to seal the joints/corners of the retaining 

angles. 

4. Be sure not to apply or get sealant within the required expansion 

gap between the sleeve and the fire wall/floor penetration. This gap 

is necessary for thermal expansion in the event of a fire. 

5. After sealant is applied and before it sets-up, press the surface of 

the sealant in place to dispel any air. Do not operate the damper 

until the sealant has become tack-free. 







This instruction sheet has been reviewed and accepted by Underwriters 

Laboratories due to test performed by Metropolitan Air Technology. 


Standard Construction: 

Sleeve:20 ga. Galvanized Steel. 

Enclosure:18 ga. Galvanized Steel. 

Transition Collars:22 ga. Galv. Steel. 

• *D = diameter 

• *W = width (duct) 

• *H = height (duct) 

• *L = length (see chart) 

• Damper frame shown as dashed lines 







16” 

(406mm) 

STEEL PLATE ONE SIDE 

(For ducts smaller than 

damper minimum size) 


Dampers Enclosures & Transitions 

Dimensions For Series S, S-RD & F/S Dampers 


PRODUCT MINIMUM LENGTH 

F/S-3V-CR...............................................10" 

S-3V .......................................................16" 

S-AF........................................................16" 

F/S-3V ...................................................16" 

c/w Jackshaft or 

OVERRIDE RELEASE 

F/S-AF .................................................. 16” 

NOTE: 

B TYPE TRANSITIONS MAY BE FURNISHED ON DAMP- 

ERS LESS THAN 8" IN HEIGHT. TRANSITION USED TO 

REDUCE MINIMUM DAMPER/SLEEVE HEIGHT OF 8" TO 

7", 6", 5" OR 4".(MINIMUM DUCT HEIGHT). 


Toll free: 800.585.7686 +1.708.552.4040 



Both electric and pneumatic damper operators are available and are 

factory installed (see methods below) with either our series smoke 

dampers, and combination fire/smoke dampers. We are constantly 

expanding our Underwriters’ Laboratories listings and therefore recommend 

that you contact the factory for the appropriateness (i.e. size 

limitations, torque, and temperature) of a given fire/smoke 

application. 







Dampers may be furnished with factory 

installed mounting plate (insert 

type: side plate) with operator. 

Damper Operators 


Dampers may be furnished with 

operators mounted inside duct 

with factory installed internal 

motor mount. 



Toll free: 800.585.7686 +1.708.552.4040 



factory installed sleeves and with 

operators mounted outside or 

inside air stream. Minimum sleeve 

depth 10" 


These installation instructions apply to the fabrication and construction 

of generic support mullions. Support mullions are necessary whenever 

fire dampers are installed into an opening that is larger than the largest 

UL rated size for that damper. The mullions allow construction of a fire 

barrier that is larger than the maximum available size. 

The opening must not exceed 120” high, but can be any width provided 

a vertical support mullion is used at a maximum of every 120”. 

To properly use support mullions they must be fabricated and installed 

according to these instructions. 

This generic support mullion is permitted by UL to only be used in 

static systems. A static system is one in which the fan shuts down in 

the event of a fire or smoke alarm. 


Fabrication & Installation Instructions For Generic 

Support Mullions 

Application 

Generic steel mullions can be used to separate vertically mounted 

galvanized steel fire dampers in wall openings larger than the UL 

permitted multiple damper assembly size. Mullions can either be 

used vertically, horizontally or both to split up a vertical wall opening 

requiring use of a damper having a 1-1/2 hour fire resistance rating. 

Maximum mullion span is 120” plus expansion allowance when used 

either horizontally or vertically. Sleeves are to be around each damper 

assembly. Mullions are not intended to be in the airstream, (i.e. exposed 

to flow) or to be a part of the ductwork. 

Wall Opening 

Steel mullions are intended for use in a concrete block or solid 

concrete wall. Hollow concrete blocks are to be filled with concrete 

(minimum 3500 psi) to permit proper mullion anchoring. 

Wall thickness is to be 7” minimum, 12” maximum. 


Toll free: 800.585.7686 +1.708.552.4040 



Support mullion assemblies consist of three basic parts: the wall 

mullion cap, the horizontal to vertical mullion cap and the mullion 

sections. Determine the number of each piece required to 

complete the installation. 

Fabrication of Wall Mullion Caps (Fig. A-A) 

Wall mullion caps must be constructed from 12 ga. steel with a minimum 

yield strength of 42,000 psi. 

1. Fabricate the formed section as shown to right. 

2. Shear the cap end plate to required dimensions. 

3. Weld the cap end plates to the formed section with 1/8” fillet welds 

completely around the top edges of the formed section. 

4. Drill and countersink 8 holes (4 on each side for 1/4 - 20 flat head 

machine screws. 

Fabrication of Mullion Sections (Fig. B-B) 

Mullions must be constructed from 16 ga. steel with a minimum 

yield strength of 42,000 psi. Important: The “D’’ dimension shown 

has been calculated to include the necessary clearances required for 

thermal expansion in the mullions. The values can be found using the 

wall opening dimensions and tables on this page. 

1. Form two identical pieces of mullion section as shown. 

2. Connect the two mullion sections together. Use 3/16” steel bind 

rivets or 3/4” long intermittent welds 12” on center and a 6” maximum 

from both ends. 

Important: Both sides of the mullion piece should be fastened 

using the method described above. 





Toll free: 800.585.7686 +1.708.552.4040 


Table 1 

Dimensional Information 

Opening 

Width/Height D H 

12 11-1/2” 3-1/4” 

24 23-1/2” 3-3/8” 

36 33-3/8” 3-1/2” 

48 47-1/4” 3-5/8” 

60 59-1/8” 3-3/4” 

72 71” 3-7/8” 

84 82-7/8” 4” 

96 94-3/4” 4-1/8” 

108 106-3/4” 4-1/4” 

120 

E = Wall Thickness – 1/2” 

F = Wall Thickness + 1/4” 

118-3/4” 4-3/8” 

© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-72b Rev 2 Page 2 of 3

Fabrication of Horizontal to Vertical Mullion Caps (Fig. C-C) 

Horizontal to vertical mullion caps must be constructed from 12 ga. 

steel with a minimum yield strength of 42,000 psi. Important: The H, E 

and F dimensions shown have been calculated to provide the correct 

performance. The values can be found by using the wall opening 

dimensions and the tables on page 2. 

1. Form the horizontal mullion channel as shown. 

2. Drill 12, 3/16” dia. holes into the horizontal mullion channel using 

the dimensions shown. 

3. Form the center channel as shown. NOTE: If the center channel is 

to be made from two pieces, weld them together with an 1/8” fillet 

weld. 

4. Shear the end plates to the dimensions required. 

5. Weld the end plates to the center channel with 1/8” fillet welds 

completely around the top edges of the center section. 






Toll free: 800.585.7686 +1.708.552.4040 


P-72c Page 3 of 3 © 2012 Metropolitan Air Technology. All rights reserved. 7/12

NOTE 

• Appropriate sleeve length is determined by adding 12” to wall or 

floor thickness, eg. An 8” wall or floor would require a 20” long 

sleeve. 

• Blade edge seals apply to Class I and II Dampers only. 

• Damper positioning dimensions for all figures are approximately 

9-3/8” from and 2-5/8” from back. 








Typical Motor Mount Locations For Fire/Smoke 

& Smoke Dampers 

Normal Right Hand Mount Normal Left Hand Mount - Standard 

Airflow 

16" 

(406 mm) 



Toll free: 800.585.7686 +1.708.552.4040 


© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-73 Rev 6 

Airflow 

16" 

(406 mm)







UL Approved 

Smoke Detector 


Duct Mounted Smoke Detector 

Typical Fire/Smoke Damper Mounting Detail 

NOTE: Minimum Size 12 x 10 



Toll free: 800.585.7686 +1.708.552.4040 


P-74 © 2012 Metropolitan Air Technology. All rights reserved. 7/12



Smoke Dampers


Low Leakage Smoke Control Dampers shall be 

Model:S-3V-I by Metropolitan Air Technology. 

Double blade edge and jamb seals shall be of the 

pressure sensitive type for low leakage. Dampers 

shall be rated for leakage as to UL 555S rating 

and shall be Class I with leakage not to exceed 8 

cfm per sq. ft. at 4.0 inches static pressure. 

Linkage shall be of the concealed type for the 



All moving parts of the damper must be inspected 

and cycled at intervals not greater than every 12 

months or in accordance with the latest edition 

of NFPA 90A, 92A, local codes and the actuator 

manufacturer. In addition, the damper and 

inspected for corrosion. Dry lubricants are 

recommended. 

Notes 

Not recommended with blades running vertically. 



S-3V-I 

W 

Model S-3V-I Low Leakage Smoke Damper 

UL 555S Classified, Class I Leakage Rated 


Toll free: 800.585.7686 +1.708.552.4040 


H 

Application 

• The Model S-3V-I is a UL Classified and labeled Class I leakage rated 

Smoke Damper. Blades are of the 3V shaped or crimped design. 

• The damper is approved for airflow in either direction and provides a 

maximum leakage of 8 cfm/sq. ft at 4” wg. s.p. It has been designed to 

be installed in a vertical or horizontal mounting position in the ductwork 

or a separate sleeve within 24” of the smoke partition. 

• These dampers are approved for use in engineered smoke control 

systems and are controlled via smoke detection system. Electric (24v, 

120v, and 230v) or pneumatic actuators are used to operate the smoke 

dampers. 

• UL 555S Classified at 250 °F or 350 °F depending upon motor/operator 





• Blades: 16 Ga. Roll formed - Galvanized Steel - 3V Blade Design 

• min. width: 4-1/4” (108mm) 

• max. width: 7-1/4” (184mm) 

• Axles: Square plated steel 

• Seals: Pressure Sensitive 450° silicone blade edge seals and flexible 




• Designed and tested in accordance to standards: UL 555S and classified 

by UL under File #R27198. They meet all the NFPA-90A, IBC Code, 

and other major code requirements for Smoke Dampers 

• Non-sleeved and side plated dampers are furnished approximately 



noted. 

Sizes (duct) 


Max. Single Section 36”W X 48”H, 914mm X 1219mm 

Max. Multiple Assembly 144”W X 96”H, 3657mm X 2438mm 

Options 

• Factory sleeves (20 Ga minimum. 16” min length) (16” X 20 ga. side 

plate provided if no sleeve is indicated) 

• Actuator 

• Electric 





Model:S-3V-II by Metropolitan Air Technology. 

Single blade edge and jamb seals shall be of the 


shall be rated for leakage as to UL. 555S rating 

and shall be Class II with leakage not to exceed 

20 cfm per sq. ft. at 4.0 inches static pressure. 








manufacturer. In addition, the damper shall be 


Notes 




S-3V-II 

W 

Model S-3V-II Low Leakage Smoke Damper 

UL. 555S Classified Class II Leakage Rated 

H 

Application 

• The Model S-3V-II is UL Classified and labeled Class II leakage rated 

Smoke Damper. Blades are of the 3V shaped or crimped design. 


maximum leakage of 20 cfm/sq. ft at 4” wg. s.p. It has been designed 

to be installed in a vertical or horizontal mounting position in the ductwork 

or separate sleeve within 24” of the smoke partition. 




dampers. 






• Blades: 16 Ga. Roll formed - Galvanized Steel - 3V Blade Design 

• min. width: 4-1/4” (108mm) 

• max. width: 7-1/4” (184mm) 






• Designed and tested in accordance to standards: UL 555S Classified 

and listed by UL under File #R27198. They meet all the NFPA-90A, IBC 

Code, and other major code requirements for Smoke Dampers 

• Non-sleeved and side plated dampers are furnished approximately 



noted. 

Sizes (duct) 




Options 

• Factory sleeves (20 Ga minimum. 16” min length)(16” X 20 ga. side 


• Actuator 

• Electric 



Toll free: 800.585.7686 +1.708.552.4040 



Due to continuing research, MAT reserves the right to 

change specifications without notice. 

S-AF-I 

W 



Model: S-AF-I by Metropolitan Air Technology. 

Double blade edge and jamb seals shall be of the 



and shall be Class I with leakage not to exceed 8 

cfm per sq. ft. at 4.0 inches static pressure. 








manufacturer. In addition, The damper shall be 

inspected for corrosion. Dry lubricants are 

recommended. 

Notes 



Model S-AF-I Low Leakage Smoke Damper 

UL 555S Classified Class I Leakage Rated 


Toll free: 800.585.7686 +1.708.552.4040 


H 

Application 

• The Model S-AF-I is a UL classified and labeled Class I leakage rated 

Smoke Damper. Blades are of the airfoil shaped design for lower 

pressure loss. 


maximum leakage of 8 cfm/sq. ft at 4” wg. s.p. It has been designed to 

be installed in a vertical or horizontal mounting position in the ductwork 


• These dampers are approved for use in engineered smoke control systems 

and are controlled via smoke detection system. Electric (24v, 120v, 

230v) or pneumatic actuators are used to operate the smoke dampers. 






• Blades: Airfoil-shaped, double skin galvanized Steel of roll-formed 

construction. 

• Min. width: 5” (127mm) 

• Max. width: 7” (179mm) 








4000 FPM and 6.0” w.g. 

• Designed and tested in accordance to standards: UL 555S classified 


Code, and other major code requirements for Smoke Dampers. 

• Non-sleeved and side plated dampers are furnished approximately 1/4” 

(6.4mm) smaller than given duct dimensions. Sleeved dampers are furnished 

approx. same size as given duct dimension, unless otherwise noted. 

Sizes (duct) 




Options 

• Factory sleeves (20 Ga minimum. 16” min length) (16” X 20 ga. sideplate 

provided if no sleeve is indicated) 

• Actuator 

• Electric 



Due to continuing research, MAT reserves the right to 

change specifications without notice. 

S-AF-II 

W 



Model: S-AF-II by Metropolitan Air Technology. 

Single blade edge and jamb seals shall be of the 



and shall be Class II with leakage not to exceed 

20 cfm per sq. ft. at 4.0 inches static pressure. 






months or in accordance with the latest edition of 

NFPA 90A, 92A, local codes and the actuator 

manufacturer. In addition, the damper shall be 


Notes 



Model S-AF-II Low Leakage Smoke Damper 

UL. 555S Classified Class II Leakage Rated 

H 

Application 

• The Model S-AF-II is a UL classified Class II leakage rated Smoke 

Damper. Blades are of the airfoil shaped design for lower pressure loss. 





• These dampers are approved for use in engineered smoke control systems 

and are controlled via smoke detection system. Electric (24v, 120v, 230v) or 

pneumatic actuators are used to operate the smoke dampers. 






• Blades: Airfoil-shaped, double skin galvanized Steel of roll-formed 

construction. 

• Min. width: 5” (127mm) 

• Max. width: 7” (179mm) 








4000 FPM and 6.0” w.g. 

• Designed and tested in accordance to standards: UL 555S rated and 

listed by UL under File #R27198. They meet all the NFPA-90A, IBC 


• Non-sleeved and side plated dampers are furnished approximately 1/4” 

(6.4mm) smaller than given duct dimensions. Sleeved dampers are furnished 

approx. same size as given duct dimension, unless otherwise noted. 

Sizes (duct) 




Options 



• Actuator 

• Electric 



Toll free: 800.585.7686 +1.708.552.4040 





Model: S-RD-I by Metropolitan Air Technology. 

Single blade edge seal shall be of the pressure 

sensitive type for low leakage. Dampers shall be 

rated for leakage as to UL. 555S rating shall be 

Class I with leakage not to exceed 8 cfm per 

sq. ft. at 4.0 inches static pressure. Linkage shall 

be jackshafted to the blade. 






manufacturer. In addition, fuse links shall be removed 

and inspected for corrosion. Dry lubricants 

are recommended. 

Notes 




S-RD-I 

Model S-RD-I True Round - Low Leakage Smoke 

Damper UL. 555S Classified Class I Leakage Rated 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The Model S-RD-I is a UL Classified and labeled Class I leakage rated 

True Round Smoke Damper. Blades are of the double thickness, round 

design. 



• to be installed in a vertical or horizontal mounting position in the ductwork 





dampers. 




• Frame: Roll formed Frame - Galvanized Steel - 16” Integral Sleeve 

• Blades: Double thickness galvanized Steel of roll-formed construction. 




• Linkage: Jackshafted to blade 





• Dampers are provided approximately 1/8” (3.2mm) smaller than given 

duct dimensions. 

Sizes (duct) 

Min. V or H - 8” - 24” Diameter, 203mm - 610mm 

Options 



• Actuator 

• Electric 










Model: S-RD-II by Metropolitan Air Technology. 

Single blade edge seal shall be of the pressure 

sensitive type for low leakage. Dampers shall be 

rated for leakage as to UL. 555S rating shall be 

Class II with leakage not to exceed 20 cfm per 

sq. ft. at 4.0 inches static pressure. Linkage shall 

be jackshafted to the blade. 






manufacturer. In addition, fuse links shall be removed 

and inspected for corrosion. Dry lubricants 


Notes 




S-RD-II 

Model S-RD-II True Round - Low Leakage Smoke 

Damper UL. 555S Classified Class II Leakage Class 

Application 

• The Model S-RD-II is a UL Classified and labeled Class II leakage rated 

True Round Smoke Damper. Blades are of the double thickness, round 

design. 








dampers. 




• Frame: Roll formed Frame - Galvanized Steel - 16” Integral Sleeve 

• Blades: Double thickness galvanized Steel of roll-formed construction. 




• Linkage: Jackshafted to blade 




Code, and other major code requirements for Smoke Dampers 

• Dampers are provided approximately 1/8” (3.2mm) smaller than given 


Sizes (duct) 

Min. V or H 8” - 24” Diameter, 203mm - 610mm 

Options 



• Actuator 

• Electric 








Toll free: 800.585.7686 +1.708.552.4040 



The M/S Switch Package provides the ability to remotely indicate the 

damper blade position. It is two integrally mounted micro switches 

for positive status indictions. Electrical interface with a remote control 

on/off fan station is also possible with the M/S package. 

The M/S Switch Package consist of the switch box, containing two 

damper position indicator switches (one closes when the damper is 

fully open and the other closes when the damper is fully closed), a 

switch box mounting bracket, a blade bracket, and hardware necessary 

to directly link the switch box to the blade. The M/S option is 

available on all MAT Manufacturing F/S Model Combination Fire/ 

Smoke Dampers, SSD Model Smoke dampers, and FD-110, FD-160 

Model Multi-blade dampers. 

Built-in Actuator Switch Packs 

Many of the newer application specific actuators designed for use on 

fire/smoke dampers feature “add-on” component position indicator 

switches manufactured and UL tested by the actuator manufacturer. 



For Combination Fire/Smoke Dampers 


when damper is closed) 

Detailed wiring diagrams including terminal designation and/or wire color coding furnished with each shipment. 









Toll free: 800.585.7686 +1.708.552.4040 


Honeywell ML4115/ML8115 and MS4X09/MS8X09 actuators are 

examples. 

Some actuator models have variants with position indicator switches 

built right in to the actuator. Honeywell MS4120F/MS8120F and 

Belimo FSNF24S/FSNF120S actuators are examples. 

When ordered with the M/S Package combination fire/smoke and 

smoke dampers that utilize these actuators will usually be supplied 

with the actuator mounted switch pack, factory installed as required 

by UL. 







Electric damper actuator or electric/ 

pneumatic solenoid valve (power 

on opens damper, power off closes 

damper). 


when damper is open) 




For Combination Fire/Smoke Dampers 


Toll free: 800.585.7686 +1.708.552.4040 



In today’s real world of budget cut backs and lack of time to periodically 

check damper operation, MAT is pleased to introduce this labor 

saving option. MAT, Model RCB-X, Remote Control Boxes are for use 

on dampers where it is desired to note dampers operation without 

the necessity of shutting the HVAC system down. NFPA, local and 

national codes state that fire and smoke dampers shall be checked 

periodically for operation. Most actuator manufacturer’s recommend 

their actuators be cycled every 6 - 12 months, to insure proper operation 

of the damper/actuator. This unit can be installed in the wall 

below the damper, a central location, mounted in the ceiling below 

the damper, or on the duct connected to the damper. When properly 

installed the building maintenance department can save as much as 

70% time in locating and checking damper operation. With a simple 

flip of the switch and watching the lights gives you the assurance 

that the damper is properly working without the need for shutting the 

HVAC system down, removing ceiling tiles, removing duct access 

doors, and using a ladder and flash light to look down the duct to see 

if the damper is closed or open. See Control Switch Functions below 

for switch function. 

Model RCB-1: 


Off switch, one red and one green light. This model can be used in 

conjunction with any of our combination fire/smoke dampers, smoke 

dampers, multi-blade fire dampers, and air control dampers with the 

proper options. The dampers must be ordered with one of the following 

options: M/S, STO/R, or DTO/R. 

Model RCB-2: 


Off/On switch, one red and one green light. This model can be used 

in conjunction with our combination fire/smoke dampers that are ordered 

with options DTO/R. This model, when wired properly, will allow 

for bypassing the lower thermostatic disk (usually 165°F or 212°F). 

While in Bypass mode, the damper will remain open until the upper 

limit thermostatic disk activates (usually 250°F or 350°F depending 

on what is ordered). 

Model RCB-3: 

The RCB-3 is a single electrical box panel that is composed of a red 

and green light. This model can be used in conjunction with any of 

our combination fire/smoke dampers, smoke dampers, multi-blade 

fire dampers, and air control dampers with the proper options. The 

dampers must be ordered with one of the following options: M/S, 

STO/R, or DTO/R. This model only incorporates lights for visual observation 

of the dampers’ blade position. 



Control Box ) For Multi-Blade Dampers 


Toll free: 800.585.7686 +1.708.552.4040 


Model RCB-4: 

The RCB-4 is a RCB-1 or RCB-2 box that has a Keyed switch for 

security controlled operation or inspection of dampers. The switch 

only controls the operation of the damper. The operation of the lights 

is independent of the switch position. Refer to RCB-1 or RCB-2 for 

more details on the specific box. 

Control Switch Functions: 

Normal/Open: Switch in this position allows the damper to operate 

as if it was wired directly to a smoke detector or other power source. 

The damper remains open until the power source is disconnected 

from a smoke detector signal, fan interlock, etc or until the temperature 

in the duct elevates above the heat responsive device located on 

the damper. 

Closed: 


the damper to close. It will remain closed until the switch is positioned 

into the normal/ open position regardless of any input signals. 

This wording is only used on RCB-1 only. 

Off: 


the damper to close. It will remain closed until the switch is 

positioned into the normal/open position regardless of any input 

signals. This wording is only used on RCB-2 only when used in conjunction 

with a DTO/R option. 

By-pass: 

Switch in this position, the operator is allowed to by-pass the low 

temperature thermostat, thus opening the damper until the air in the 

duct elevates to high temperature thermostat limit. At this time the 

damper will close and cannot be re-opened. 

Green Light (Open): 


when the blades are open. Standard ratings for this light are 



Red Light (Closed): 


when the blades are closed. Standard ratings for this light are 




Note 

• Remote Control Boxes are standardly shipped loose from damper 

for field wiring and desired placement. Choose the wiring diagram 

below with the correct option (standard/fusible link, STO/R, or 

DTO/R) ordered for proper wiring details. 

• Boxes are standardly shipped with 120vac lights. Special and 

indicate on order 24vac or vdc lights if needed. 



Control Box ) For Multi-Blade Dampers 


• Wires indicated are for M/S Package mounted on the right hand 

side of the damper. If the M/S package is on the left hand side, 

then the open/close wires will need to be switched. 


Toll free: 800.585.7686 +1.708.552.4040 


P-84 Rev 4 Page 2 of 2 © 2012 Metropolitan Air Technology. All rights reserved. 7/12 

Blk. 

Orange 

Blue 

Blk.

Installation Details 

1. Dampers should be installed to provide proper operation and 

performance. They should be installed to permit them to maintain 

their shape and remain square. Do not compress or stretch damper 

frame. Damper should be installed as to prevent any racking. 

2. The dampers should be attached to the duct (s), sleeve or wall 

opening using No. 10 sheet metal screws, 1/4” dia. (6.4 mm) bolts 

and nuts, 1/2” (12.7 mm) long welds or 3/16” (4.8 mm) dia. steel 

pop rivets,12” (304.8 mm) on center with a minimum of three fasteners. 

As well, when dampers are installed as a multiple damper 

assembly, the damper frames should all be attached to each other 

as outlined above. 

3. All joints where the damper frame meets the duct or sleeve should 

be sealed using a 1/8” (3.2 mm) bead of sealant -CGE1200 Silicone 

Construction Sealant, Dow Corning Silastic 732, Nufl ex 302, or GE 

RTV 108 As well, when dampers are installed as multiple damper 

assembly, all joints between the damper frames should be sealed 

as outlined above. 


Smoke Damper Installation Instructions 



Toll free: 800.585.7686 +1.708.552.4040 


Smoke dampers must be installed at or adjacent to the point where 

the duct passes through the smoke barrier in accordance with NFPA 

90A. The maximum installation distance is 24” (609mm) from the 

smoke barrier, however, the preferred location of leakage rated smoke 

dampers is in the smoke barrier. Duct air outlets, inlets or branches 

shall not be located between the smoke damper and the smoke barrier. 

Smoke dampers must not be installed in fibrous glass-lined ducts 

and fibrous glass ducts in a manner that will damage the material. 

Use a hat section standoff, lining interruption, metal sleeves or sections 

on externally insulated metal duct. Provide a duct hanger at a 

smoke damper location when the duct strength is inadequate for the 

damper and its operator. If the damper operator is located within the 

duct, an access door must be provided. 





In addition, the damper shall be removed and inspected for 


Duct Air Outlet, Inlet or Branch 

Multiblade Damper 


Jackshafting: Standard Construction 

1. Bearing support bracket. Located at either end of assembly and at 

each vertical mullion. 

2. Lever arm attached directly to blade axle to maximize torque 

transfer. 

3. Either .500” (12.7 mm) diameter solid steel rod or rod + .750” (19.1 

mm) diameter steel pipe (depending on damper size, static pressure, 

etc.) 

4. Pivot arm of heavy gauge steel and attached to rotation bar 

5. Operator arm for connection to motor operator. (Required for internal 

motor mount.) 

6. Ball bearings. 


Actuators & Jackshafting Dimensions 

F/S-3V 

F/S-AF 

S-3V 

S-AF 


NOTE 

Dampers are intended to be self-supporting only in the largest 

recommended single sections. Multiple assemblies may require may 

require additional bracing. Metropolitan Air Technology Manufacturing 

recommends appropriate bracing on multiple assemblies at over 6’ of 

width and height. 








Toll free: 800.585.7686 +1.708.552.4040 



Standard Construction: 

Sleeve:20 ga. Galvanized Steel. 

Enclosure:18 ga. Galvanized Steel. 

Transition Collars:22 ga. Galv. Steel. 

• *D = Diameter 

• *W = Width (Duct) 

• *H = Height (Duct) 

• *L = Length (See Chart) 

Damper Frame Shown As Dashed Lines 







16” 

(406mm) 

STEEL PLATE ONE SIDE 


Dampers Enclosures & Transitions Dimensions 

For Series S, S-RD & F/S Dampers 



Toll free: 800.585.7686 +1.708.552.4040 


PRODUCT MINIMUM LENGTH 

F/S-3V-CR...............................................10" 

S-3V .......................................................16" 

S-AF........................................................16" 

F/S-3V ...................................................16" 

c/w Jackshaft or 

OVERRIDE RELEASE 

F/S-AF .................................................. 16” 

NOTE: 

B TYPE TRANSITIONS MAY BE FURNISHED ON 

DAMPERS LESS THAN 8" IN HEIGHT. TRANSI- 

TION USED TO REDUCE MINIMUM DAMPER/ 

SLEEVE HEIGHT OF 8" TO 7", 6", 5" OR 4".(MINI- 

MUM DUCT HEIGHT). 


Both electric and pneumatic damper operators are available from 

Metropolitan Air Technology and may be factory installed (see methods 

below). We are constantly expanding our Underwriters’ Laboratories 

listings and therefore recommend that you contact the factory for 

the appropriateness (i.e. size limitations, torque, and temperature) of 

a given fire/smoke application. Control dampers may be shipped with 

factory installed motors provided we have the following information: 

1. damper/duct size 

2. maximum velocity 

3. maximum static pressure 

4. application (shut-off, balancing or modulating damper) 

5. location of operator (internal or external); 6. pneumatic or electric 

system. 


factory installed side plate operator 

attached. Operator mounted 

out of airstream. 


Smoke Damper Operators 


operators mounted inside duct 

with factory installed internal 

motor mount. 









Toll free: 800.585.7686 +1.708.552.4040 


P-88 Rev 4 © 2012 Metropolitan Air Technology. All rights reserved. 7/12 

Dampers may be furnished 

with factory installed sleeves 

and with operators mounted 

outside or inside air stream. 

Minimum sleeve depth 10"


Motor/Actuators UL Classified Products 

Fire Dampers & Combination Fire & Smoke Dampers 

OPERATORS 






Mounting 

Power 

Supply 


F/S-3V and S-3V F/S-AF and S-AF 






Siemens #4, 331-2961 External 25 psi 

6 sq. ft., 36"w, 48"h 

12 sq. ft., 36"w, 48"h 

6 sq. ft., 36"w, 48"h 

12 sq. ft., 36"w, 48"h 


Belimo FSLF-24 Internal / External 24 vac 36” w or 48” h, 4 sq. ft. 36” w or 48” h, 4 sq. ft. 

Siemens GND-121 Internal / External 24vac 36” w or 48” h, 4 sq. ft 36” w or 48” h, 4 sq. ft 

Honewell ML-8115 External 24 vac 36” w or 48” h, 6 sq. ft n/a 







Honeywell ML-4115 External 120 vac 36” w or 48” h, 6 sq. ft. n/a 







Honeywell ML-4115C/D External 120 vac 36” w or 48” h, 6 sq. ft. n/a 





Accessories 






*Consult Factory for actuator and damper sizes on velocities up to 4000 FPM and 6” w.g., 36x36 max single section 

MS-4120 Series actuator, 250˚F Only, FS-AF, S-AF, FDD-AF, FD-AF Models. 

Other Actuators UL Approved: Honeywell MS-8209, 4209, 4709, 4309, 4809, 8309. 


Toll free: 800.585.7686 +1.708.552.4040 




Motor/Actuators UL Classified Products 

Fire Dampers & Combination Fire & Smoke Dampers 

OPERATORS 






Mounting 

Power 

Supply 



F/S-3V and S-3V F/S-AF and S-AF F/S-RD, S-RD 

Max. Velocity 2000 FPM Max. Velocity 2000 FPM Max. 



Dia. 


Siemens #4, 331-2961 Internal / External 25 PSI 




36” w or 48” h, 12 sq. ft.- Class 2 

24” 

24” 







Honeywell ML-8120F* External 24 vac 36” w or 48” h, 12 sq. ft. 36” w or 48” h, 12 sq. ft. 24” 











Honeywell ML-4115C/D External 120 vac 36” w or 48” h, 6 sq. ft. n/a 24” 





Accessories 






*Consult Factory for actuator and damper sizes on velocities up to 4000 FPM and 6” w.g., 36x36 max single section with 

with Honeywell MS-4120 Series actuator, 250˚F Only, FS-AF, S-AF, FDD-AF, FD-AF Models. 

Other Actuators UL Approved: Honeywell MS-8209, 4209, 4709, 4309, 4809, 8309. 


Toll free: 800.585.7686 +1.708.552.4040 





Radiation Dampers

Extended Frame* 



and cycled once the first year and at intervals not 

greater than every 4 years or in accordance with 

the latest edition of NFPA 90A, 92A, local codes 

and the manufacturer. In addition, fuse links shall 

be removed and inspected for corrosion. Dry lubricants 




C-RD, C-RD-A w/ Volume Controller 

+ 

+ Duct Dimension Less 1/16” (1.6mm) unless ordered actual size. 

Extended Frame Table* 

Size 

(D) 

Model C-RD Ceiling Damper Round 

UL 555C Classified Assemblies Approved for 1- 4 Hour Rated 

Frame Depth 

(H) 

5” to 10” (127mm to 254mm) 6-3/4” (171mm) 

11” to 14” (279mm to 356mm) 8-3/16” (208mm) 

15” to 18” (381mm to 457mm) 11-3/4” (298mm) 

+ Std is 1”. Bottom Extension is 2.5” 

+ 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

The Model C-RD is a round UL Classified ceiling (radiation) damper, 

butterfly style, approved for steel duct, flex duct and ductless installations 

in approved UL ceiling designs that incorporate/show a hinged door 

damper requiring fire/heat protection where HVAC components penetrate 

the ceiling membrane. These dampers provide protection up to 18” 

(467mm) diameter openings. 


• Frame: 24 Ga. - Galvanized Steel 

• Blades: 22 Ga. - Galvanized Steel, un-insulated up to 10” with UL 

classified insulation (Over 10”) 

• Spring: Corrosion resistant steel spring. 

• Fusible Link: Replaceable 212°F (100°C) standard (others available) 

• Designed and tested in accordance to standards: UL 555C Classified 


Code, and other major code requirements for Ceiling (Radiation) Dampers. 

Sizes (duct) 

Min. V or H 5” Diameter, 127mm 

Max. Single Section 18” Diameter, 457mm 

C/FSR-2 will be supplied for 19” Diameter (482mm) and, 20” Diameter 

(508mm) 

Options 

• Volume Adjustment 

• Thermal Blanket - 1/8” thick (24 X 24)-CK2000-1 (Required on T-Bar or 

on surface mtd. diffuser larger than 1” in any direction of diffuser neck 

opening) 

• Alternate Thermal Blanket 1-1/4” Batt (24X24) CK-2000-1B (Required 

on t-bar or surface mtd. diffuser larger than 1” in any direction of 

diffuser neck opening) 


Round Ceiling damper’s shall be Model C-RD or C-RD-A by Metropolitan 

Air Technology. Ceiling dampers shall bear the Underwriters’ Laboratories 

label and be rated for both steel duct and flex duct installations. No 

external damper supports shall be required for ceiling dampers up to and 

including 18” (457mm) diameter. Ceiling dampers shall be non-asbestos 

type and be furnished with a fusible link volume controller where shown 

(Model C-RD-A). 








be removed and inspected for corrosion. Dry 

lubricants are recommended. 



C-RD-T, C-RD-A/T w/ Volume Controller 

Model C-RD-T Ceiling Damper Square & Rectangular 

U.L. 555C Classified Assemblies Approved for 1 - 4 Hour Rated 

* * * Standard x D + 2” 

+ Duct Dimension Less 1/16” (1.6mm) unless 

ordered Actual Size. 

C-RD-A/T 

with Adjustable Volume Controller 

Extended Frame Table* 

Size 

(D) 

Frame Depth (H) 

5” to 10” (127mm to 254mm) 6-3/4” (171mm) 

11” to 14” (279mm to 356mm) 8-3/16” (208mm) 

15” to 18” (381mm to 457mm) 11-3/4” (298mm) 

Application 

The Model C-RD-T (-A/T) is a square neck diffuser to a round duct, UL 

classified ceiling (radiation) damper, butterfly style approved for both steel 

duct, and flex duct installations in approved UL ceiling designs that incorporate/show 

a hinged door damper requiring fire/heat protection where 

HVAC components penetrate the ceiling membrane. These dampers 

provide protection up to 22” x 22” (559mm x 559mm) diffuser opens and 

an 18” (457mm) diameter duct opening. 


• Frame: Roll formed. - 22 Ga.Galvanized Steel 

• Blades: 22 Ga. - Galvanized Steel, un-insulated 9 X 9 (81 sq in.) and 

under with UL Classified Insulation over 9 X 9 (81 sq in.) 





Code, and other major code 

Sizes (duct) 

Min. Size 5” Diameter, 127mm 

Max. Size 18” Diameter, 457mm 

Options 

• Volume Adjustment 

• Thermal Blanket - 1/8” thick (24 X 24)-CK2000-1 (Required on T-Bar or 

on surface mtd. diffuser larger than 1” in any direction of diffuser neck 

opening) 

• Alternate Thermal Blanket 1-1/4” Batt (24X24) CK-2000-1B (Required 

on t-bar or surface mtd. diffuser larger than 1” in any direction of 

diffuser neck opening) 


Square to round ceiling dampers shall be Model C-RD-T or C-RD-A/T by 

Metropolitan Air Technology. Ceiling dampers shall bear the Underwriters’ 

Laboratories label and be rated for both steel duct and flex duct installations. 

No external damper supports shall be required for ceiling dampers 

up to and including 18” (457 mm) diameter. Ceiling dampers shall be of 

the non-asbestos type and be furnished with a fusible link volume controller 

where shown (Model C-RD-A/T). 


Toll free: 800.585.7686 +1.708.552.4040 



+ Std is 5/8”. Bottom extended is 2.75” 

Extended Frame Size 

(L) 



C-S/R, C-S/R-A w/ Volume Controller 

Model C-S/R Ceiling Damper Square And Rectangular 


+ Duct Dimension Less 1/8” (3.2mm) unless 

ordered actual size. 

Frame Depth 

(H) 

4” to 10” (102mm to 254mm) 6-3/8”” (162mm) 

11” to 14” (279mm to 356mm) 8-3/16” (208mm) 

15” to 22” (381mm to 559mm) 11-3/16” (284mm) 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

The Model C-S/R (-A) is a square/rectangular UL Classified ceiling (radiation) 

damper, butterfly style, approved for both steel duct and ductless 

installations in approved UL ceiling designs that incorporate/show a 

hinged door damper requiring fire/heat protection where HVAC components 

penetrate the ceiling membrane. These dampers provide protection 

up to 22” x 22” (559mm x 559mm) openings. 



• Blades: 22 Ga. - Galvanized Steel, un-insulated 80 sq in. and under 

with UL Classified Insulation over 80 sq in. 






Sizes (duct) 

Min. Size 4” X 6”, (101mmX 152mm) 

Max. Size 22” X 22”, (559mm X 559mm) 


Square and rectangular butterfly ceiling dampers shall be by Metropolitan 

Air Technology. Ceiling dampers shall bear the Underwriters Laboratories 

label and be rated for both steel duct and flex duct installations. Ceiling 

dampers shall have been investigated by Underwriters Laboratories for 

use in lieu of a hinged door type damper as defined in UL 555C. Note 

that ceiling dampers covered by this scheme are only intended for use in 

those UL fire resistive designs that indicate the use of a hinge door type 

damper in the design. No external damper supports shall be required for 

ceiling dampers. Ceiling dampers shall be of the non-asbestos type and 

be furnished with a fusible link, 165°F or 212°F (74°C or 141°C) (specifier 

select one). Curtain fire dampers are not permitted. 


All moving parts of the damper must be inspected and cycled once the 

first year and at intervals not greater than every 4 years or in accordance 

with the latest edition of NFPA 90A, 92A, local codes and the manufacturer. 

In addition, fuse links shall be removed and inspected for corrosion. 

Dry lubricants are recommended. 








be removed and inspected for corrosion. 



C-S/R-HC, C-S/R-HC-A 

* 

Model C-S/R-HC Ceiling Damper Square & Rectangular 

UL 555C Classified Approved for 1 Hour Rated 

W 

MAT 

Application 

• The Model C-S/R-HC is a square/rectangular UL Classified ceiling (radiation) 

damper, butterfly style, tested and specifically approved for specific 

UL ceiling designs listed below incorporating wood joist and gypsum 

construction. UL designs specifically approved for this damper are L501, 

L502, L503, L506, L507, L508, L512, L513, L514, L515, L516, L517, 

L519, L522, L523, L524, L533, L545, AND ULC M500 Series designs. 

• These dampers provide protection up to 16” x 12” (406mm x 305mm) 

openings. 

• Standard ceiling radiation designs approved to UL 555C standard are 

not acceptable to be used in designs mentioned above. Refer to UL 

Fire Resistance Directory for further details. 



• Blades: 22 Ga. - Galvanized Steel 


• Fusible Link: Replaceable 212°F (100°C) standard/165°F(74°C) available 

• Round Inlet: 4”, 5”, 6” 

• Oval Inlet: 6”, 8”, 10” 




Sizes (duct) 

Rectangular C-S/R-HC 

Min. Vertical Size 4” X 6”, (101mmX 152mm) 

Max. Vertical Size 16” X 12”, (406mm X 305mm) 

Round C-RD-HC 

Min. Vertical Size 5” Diameter, (127mm) 

Max. Vertical Size 15” Diameter (381mm) 

Max height including insulation *91/4” 

Dampers less than 110 sq. in. are shipped without gypsum installed on damper. 

Gypsum shall be field supplied for damper and ceiling. Dampers greater than 110 

sq. in. are shipped with insulation factory installed on blades and box. 


Ceiling dampers shall be Metropolitan Air Technology Manufacturing 

models: C-S/R-HC. The dampers shall bear the UL label identifying them 

to be approved for use in a UL ceiling design LXXX. Dampers shall be 

listed in the UL Fire Resistance Directory as being approved for use in the 

submitted ceiling being installed. These ceiling dampers shall be installed 

per the manufacturer’s installation instructions which were approved by 

Underwriter’s Laboratories. Approved dampers from other agencies are not 

permitted for approval on a UL system. Standard ceiling radiation dampers 

approved for use in placed of hinged door dampers are not acceptable. 


Toll free: 800.585.7686 +1.708.552.4040 





C/FS, C/FSB, C/FSX 

Model C/FS Ceiling Damper Square & Rectangular 


*Duct Dimension less 1/4” (6mm) 

unless specified actual size. 

Oversized damper with “B” channel transitions 

Square or rectangular, non-asbestos 

(CK-2000 - Skirts) 10” Wide standard 

Damper with thermal blanket skirt for non-ducted 

return air penetrations 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The Model C/FS is a square/rectangular UL Classified ceiling (radiation) 

damper, fabric blade style, approved for both steel duct and ductless 

installations in approved UL ceiling designs that incorporate/show a 

hinged door damper requiring fire/heat protection where HVAC components 

penetrate the ceiling membrane. 

• This damper has a low profile design that allows for installation in ceiling 

with restricted space. 

• The folded blade package allows for a maximum free area and lowest 

pressure drop. 


openings. 



• Blades: 22 Ga. - Galvanized Steel and Insulated Fabric 

• Spring: Stainless Steel negator 




Code, and other major code requirements for Ceiling 

Sizes (duct) 

C/FS & C/FSX 



C/FSB 

Min Size 4” X 4”, (102mmX 102mm) 

Max Size 24” X 22”, (610mm X 559mm) 


Square and rectangular butterfly ceiling dampers shall be Model C/FS or 

C/FSB by Metropolitan Air Technology. Ceiling dampers shall bear the 

Underwriters’ Laboratories label and be rated for both ducted (C/FS and 

C/FSB) or non-ducted (C/FSX) air systems. Ceiling dampers shall be of 

the non-asbestos, curtain type for maximum free area. 









Square to round ceiling dampers shall be Model 

C/FSR-1 or C/FSR-2 by Metropolitan Air Technology. 

Ceiling dampers shall bear the Underwriters’ 

Laboratories label and be rated for both steel duct 

and flex duct installations. Ceiling dampers shall 

be of the non-asbestos, curtain-type for maximum 

free area. 







be removed and inspected for corrosion. 



C/FSR-1, C/FSR-2 

D* 

Model C/FSR-1 Ceiling Damper Square To Round 

UL 555C Classified Assemblies Approved for 1 - 4 Hour Rated 

Diameters: 

Min. 4” (101mm) 

Max. 22” (559 mm) 

3.750” 

(95mm) 

W* L* 

* Duct Dimension Less 1/4”(6mm) 

Unless Specified Actual Size. 

Application 

• The Model C/FSR-1 is a square/rectangular UL Classified ceiling (radiation) 

damper, fabric blade style, with a round transition mounted to the 

top side approved for both steel duct and flex duct installations in approved 

UL ceiling designs that incorporate/show a hinged door damper 

requiring fire/heat protection where HVAC components penetrate the 

ceiling membrane. 

• This damper has a low profile design that allows for installation in 

ceiling with restricted space as well as transitioning from a square neck 

diffuser to a round duct. 

• The folded blade package allows for maximum free area and lowest 

pressure drop. 


openings. 



• Blades: 22 Ga. - Galvanized Steel w/ UL Classified insulated fabric blades 



• C/FSR-1: one round transition - (Top) 

• C/FSR-2: two round transitions - (Top and Bottom) 




Min. Size LxW - 6” x 6”, (152mm x 152mm) 

D - 4” Diameter, (101mm) 

Max. Size LxW - 24” x 24”, (610mm x 610mm) 

D - 22” Diameter, (559mm) 

Options 

• CK-2000-1: 1/8” Thick Thermal Blanket (24 X 24) 

• CK-2000-1B: 1-1/4” Thick Batt-Mineral 

• Wool Blanket (24 X 24) 


Toll free: 800.585.7686 +1.708.552.4040 





C/FS-2F 

Models: 

C/FS-2F: Square or rectangular, non-asbestos 

Model C/FS-2F Slimline Ceiling Damper Square & 

Rectangular U.L. 555C classified assemblies Approved for 1 - 4 Hour Rated 

non-ducted return air penetrations 

*Duct dimension less 1/4” (6mm) 

unless specified actual size. 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The Model C/FS-2F is a slimline (low profile) square/rectangular UL 

Classified ceiling (radiation) damper, fabric blade style, approved for 

both steel duct or ductless installations in an approved UL ceiling 

design that incorporate/show a hinged door damper requiring fire/heat 

protection where 

• HVAC components penetrate the ceiling membrane. 

• This damper has a lower profile design that allows for maximum free 

area and lowest pressure drop. 


openings. When approved by AHJ, this damper is perfect for use below 

ceiling exhaust fans. 



• Blades: 22 Ga. - Galvanized Steel w/ UL Classified insulated fabric 

blades 



• Designed and tested in accordance to standards: UL 555C Classified and 

listed by UL under File #R27199. They meet all the NFPA-90A, IBC Code, 

and other major code requirements for Ceiling (Radiation) Dampers. 




Square and rectangular butterfly ceiling dampers shall be Model C/FS-2F 

by Metropolitan Air Technology Manufacturing. Ceiling dampers shall bear 

the Underwriters’ Laboratories label and be rated for both ducted or 

non-ducted air systems. Ceiling dampers shall be of the non-asbestos, 

curtain type for maximum free area. 










C/D-P 

Model C/D-P Ceiling Damper Square & Rectangular 


OPENING DIMENSION LESS 1/4” (6mm) 

Application 

• The Model C/D-P is a square/rectangular UL Classified ceiling (radiation) 

damper, hinged door style, approved for both steel duct and 

ductless installations in approved UL ceiling designs that incorporate/ 

show a hinged door damper requiring fire/heat protection where HVAC 

components penetrate the ceiling membrane. 


openings. 

• These dampers are held open by fuse link being suspended from above 

structure. 



• Blades: 22 Ga. - Galvanized Steel w/non-asbestos UL Classified insulation 


• Opening: 576 sq. in. (14,630 sq. mm) 




Nominal Size 12” X 12”, (305mmX 305mm) 

Actual Size 11-3/4” X 11-3/4”, (298mm X 298mm) 






Square and rectangular ceiling dampers shall be Model C/D-P by Metropolitan 

Air Technology. Ceiling dampers shall bear the Underwriters’ 

Laboratories label and be rated for both ducted or non-ducted air systems. 

Ceiling dampers shall be of the non-asbestos type and shall require 

no external shroud protection. 








Toll free: 800.585.7686 +1.708.552.4040 




Model CK-2000-1 (B) Thermal Blankets 

UL. 555C Classified 4 Hour Rated 

24” X 24” 


CK-2000-1 (1/8” THICK), CK-2000-1B (1-1/4” THICK) 


Toll free: 800.585.7686 +1.708.552.4040 


Application 

• The Model CK-2000-1 (B) is UL Classified under Batts and Blankets 

as being UL approved for use on the back of diffusers when used in 

conjunction with square, rectangular, round or square to round ceiling 

dampers manufactured by Metropolitan Air Technology. 

• This blanket is supplied in 24” x 24”(610mm x 610mm). 

• Openings in blanket are to be field cut to match diffuser. 


• Listed and labelled by UL for openings up to 576 sq. in., (3,716 sq. cm) 

rated 4 hrs. or less. 

• Lightweight, non-asbestos fabric can be easily installed in the field. 

• Allows for ceiling openings larger than duct size. (e.g. lay-in diffusers) 

• Tested up to 2000°F (1093°C) at 4 hours. 




Alternate Thermal Blanket 

CK-2000-1B, 1-1/4” batt mineral wool - 24” X 24” 


Thermal blanket diffuser protection shall be Model CK-2000-1 (-B) by 

Metropolitan Air Technology. Thermal blanket shall bear the Underwriters’ 

Laboratories label and be rated for the back of diffusers when used 

in conjunction with square, rectangular, round or square-to-round ceiling 

dampers as manufactured by Metropolitan Air Technology. 

Note 

Thermal blanket diffuser protection shall be Model CK-2000-1 (-B) by 

Metropolitan Air Technology. The thermal blanket shall be provided with 

each ceiling damper for installation where the diffuser opening is more 

than 2” (51mm) larger than the opening through the ceiling membrane. 


MODEL 

NO. 

C/FS 

C/FSB 

C/FSX 

C/FS-2F 

C-RD 

C-RD-A 

C-RD-T 

C-RD-A/T 

C-S/R 

C-S/R-HC 

C/D-P 

C/FSR-1 

CK-2000-1 

CK-2000-1B 4 Hrs. 


Ceiling Dampers Complete Range Of 1-4 Hour Rated Fire/Heat Insulation 

Devices & Accessories For Penetrations In Fire-Rated Ceiling Assemblies 

RATING 

3-4 Hrs. 

3-4 Hrs. 

3-4 Hrs. 

3-4 Hrs. 

3-4 Hrs. 

3-4 Hrs. 

3-4 Hrs. 

3-4 Hrs. 

3-4 Hrs. 

1 Hr. 

3-4 Hrs. 

4 Hrs. 

4 Hrs. 

SIZE RANGE 

4" x 4" to 24" x 24" 

4" x 4" to 24" x 22" 

4" x 4" to 24" x 24" 

4” x 4” to 24” x 24” 

5" - 18" Diameters 


5" - 18" Diameters & 

22" x 22" max. transition 


22” x 22” max. transition 

4” x 6” to 22” x 22” 

4” x 6” to 16” x 12” 

12" x 12" to 24" x 24" 


6” x 6” to 24” x 24” 

Max. 24x24 Diffuser 

Max. 24x24 Diffuser 


All moving parts of the damper must be inspected and cycled once the first year and at intervals not greater than every 4 years or in 

accordance with the latest edition of NFPA 90A, 92A, local codes and the manufacturer. In addition, fuse links shall be removed and 



APPLICATIONS: FOR CEILING PENETRATIONS 

AS A RESULT OF . . . 

Square or rectangular steel ducts and/or steel 

steel grilles or diffusers of the surface mount type. 

Fabric blade damper. 

Same as above. Damper with B type transition. 

Square or rectangular openings for non-ducted, 

plenum return air systems. Fabric blade damper. 

Same as C/FS damper except has a lower height 

profile 

Round neck diffusers with either flex or steel duct 

connections. Butterfly blade type damper. 

Same as above with adjustable volume controller 

on damper. 

Square neck diffusers with either flex or steel duct 

connections. Damper complete with steel transition 

plate for square or rectangular neck diffusers. 

Same as above with adjustable volume controller 

on damper. 

Square or rectangular steel ducts and/or steel grills 

or diffusers. Butterfly blade type damper. 

Square or rectangular steel ducts when installed in 

specific UL wood and gypsum ceiling designs. 

Square or rectangular openings and/or ducts. 

Hinge door type damper. 

Square neck diffusers and round ducts. 100% free 

area Damper. Fabric blade type damper. 

Thermal Blanket (non-asbestos) for protection of 

the unexposed side of lay-in type steel air diffusers. 

Die cut single pieces, 1/8” thick. 

Thermal Blanket (non-asbestos) for protection of 

the unexposed side of lay-in type steel air diffusers. 

Die cut single pieces, 1-1/4” Thick. 


Toll free: 800.585.7686 +1.708.552.4040 



These installation instructions apply to ceiling radiation dampers 

mounted in 3 hour rated ceiling with supports from (1) a ceiling grid 

system, (2) ductwork above, or (3) structure above. Each type of 

damper support system is described with damper being mounted in 

conjunction with various air devices. 

Ceiling Radiation Damper Application 

Underwriters’ Laboratories (UL) labeled ceiling radiation dampers 

are designed to function as a heat barrier in air handling duct outlets 

penetrating fire resistive membrane ceilings. They provide the necessary 

protection for air inlet and outlet penetrations in assembles up to 

3 hours, which are designed incorporating a “hinged door” damper. 

They are intended to restore and maintain the fire resistive integrity 

of the assembly and are for use in lieu of hinged door type dampers. 

Our UL labeled ceiling radiation dampers may be substituted for 

hinged door type dampers in individual ceiling designs as defined in 

UL’s Fire Resistance Directory. For ceiling construction, refer to the 

UL Fire Resistance Directory. 

General Notes 

All assembly components such as hanger wires, diffuser pans, duct 

drops, sleeves, and ducts shall be constructed of steel. The instructions 

shown in these details are of a general nature. Actual installation 

must also conform to the UL Design as listed in the UL Fire Resistance 

Directory. Ceiling penetrations should be located within ceiling 

tiles or panels without necessitating cuts in the ceiling suspension 

main runners or cross tees. If required, a maximum of one cross 

runner or cross tee may be cut to enable proper damper location and 

installation. Each cut end shall be supported by a min. 12 SWG vertical 

hanger wire. Hanger wires shall not be sprayed. A 1/2” clearance 

must be maintained between the opening and the cut end of the runner 

or cross tee. In installations where the ceiling opening is greater 

than 1” larger (in any direction) than the ceiling damper, a thermal 

blanket (Ck-2000) shall be used to cover the exposed steel pan of the 

grille. If flex duct is used, it must be Class O or I type, bearing the UL 

listing mark. All butterfly type dampers are shipped from the factory 

with the blades closed. Even though one type of damper is shown 

in each drawing, all dampers mount in the same manner as the one 

shown, see Detail A. 

Connection Notes 

Attachment at locations, such as grille/damper and damper/duct, 

shall be min. #8 sheet metal screws, 3/16” steel rivets, 1/4” tack 

welds, or 1/4” nut and bolts. Fasteners for square/rectangular connections 

shall be a minimum of one per side spaced on a maximum 

of 6” centers. Fasteners for round connections shall be a minimum 

of 3 evenly spaced around the diameter up to a maximum of 6” on 

center. The connection of the damper and grille can be such that 

the damper slides over the neck of the grille or inside the throat of 

the grille. While installing fasteners, take special care so they do not 


Ceiling Radiation Dampers Installation Instructions 

Models Covered by These Instructions: C-RD(-A), C-RD-T(-A/T), C-S/R(-A), C/FS(-2F), 

C/FSB, C/FSX(-2F), C/FSR-1, C/FSR-2, C/D-P 


Toll free: 800.585.7686 +1.708.552.4040 


interfere with the operation of the damper blades. When hanger wires 

are used, they must hang vertically and not be splayed, they are to be 

perpendicular to ceiling. 

Thermal Blanket 

In those installations where the opening in the ceiling membrane 

is larger than the ceiling damper (more than 1” in any dimension), 

a Thermal Insulating Blanket CK-2000-1 or CK-2000-1B must be 

installed by laying over the exposed surface of the air inlet or outlet 

device. The Thermal Blanket rests upon and protects exposed portions 

of the air device and may fit inside adjacent Tee Bars (if any), 

or overhang the tee bar as with model C/FSX. 

Fusible Link 

(Butterfly Type) Models C-S/R(-A), C-RD(-T or-A/T) are shipped from 

the factory closed. The fusible link must be installed at time of installation 

such that the blades are held open as shown at the right, Detail 

B. Model C/D-P must have link installed after installation to duct or 

structural member above, (See Figure 3) 

Dampers supported by a ceiling grid system 

Exposed Tee bar ceiling grid systems often use “Lay In” supply and 

return grilles. With attention to the following requirements, the ceiling 

grid system provides all required support for installation of “Lay In” 

style ceiling dampers and the grilles. Ceiling openings up to a 24” x 

24” (576 sq. in.) maximum are allowable. Maximum size limits of each 

individual ceiling damper model must be observed. 

The four corners of the tee bar containing the air device (or the midpoint 

of the adjacent cross-tees) shall be directly supported from the 

structural members of the floor or roof above it by 12 SWG minimum 

vertical hanger wires. When the duct extends over the intersections of 

the grid members, 16 ga. x 1-1/2” steel channels with 9/16” minimum 

flanges shall be used to ensure that the grid is supported from 

structural members by 12 SWG minimum hanger wires. All UL Classified 

ceiling assemblies require lay-in ceiling panels be cut to fill the 

remainder of hole openings larger than 24” x 24” and shall provide a 

minimum of 3/8” bearing on the ceiling grid members. 

Lay-In Diffuser Non-Ducted or Flex Duct Applications (Figures 1 

and 1A) 

Lay-In diffuser installs directly into exposed Tee bar grid system. 

Ceiling damper attaches to diffuser neck (See Figure 1) Thermal 

Blanket may be required (See Thermal Blanket Above) If flexible duct 

is used (See General Notes Above) it shall be fastened to the diffuser 

neck with a steel clamp or #16 SWG minimum wire. 

1. The flexible air duct shall not rest on the back surface of the ceiling 

grid or panels (provide a minimum of 4” clearance). 

2. The flexible air duct shall not interfere with the closing of the ceiling 

damper. 


For Models C/FSX (See Fig. 1, Page 1) 

Damper is supported directly by the grid system and may lay on top 

of perforated metal (or similar) grille core material Skirt material must 

overhang the Tee bars around perimeter of damper. 





Item/Description 

1.Grille Frame (Steel) 

2.Diffuser or Grille Core (Metallic or Non-Metallic) 

3.Sheet Metal Duct 

4.#8 Sheet Metal Screw 

5.Ceiling Radiation Damper 

6.16 MSG X 1-1/2” Channel 

7.Ceiling Grid (UL Classified) 

8.Duct Drop 

9.12 SWG Steel Wire 

10.Acoustical Lay-In Panels (UL Classified) 

11.Rigid Gypsum/Drywall Wall Board Ceiling (UL Classified) 

12.Thermal Blanket, CK-2000-1 (-B) 

Hinge Door Applications (Figure 3) 

For Model C/D-P Ceiling radiation damper is the same size as 

the ceiling opening and installs directly into the exposed Tee 

bar grid system opening. Damper is supported directly by the 

grid system and may lay on top of perforated metal (or similar) 

grille core material Fusible Link support wire must attach to 

duct or ceiling supports above. 

Dampers Supported By Ductwork Above 

Note: When main ducts are supported by 16 ga. x 1-1/2” steel 

channels (with 9/16” minimum flanges) located 1” to 3” from 

and on both sides of a steel duct drop and these channels are 

suspended by #12 SWG wire from structure above. The steel 

duct drop provides all required support for ceiling damper and 

grilles. Air diffuser flange must overlap the ceiling membrane 

by a minimum of one inch. 

Follow guidelines on Page 1 when preparing opening in the 

ceiling membrane and making connections. 

Lay-In Diffuser with Steel Duct Drop (See Fig. 2) 

Lay-In Diffuser with steel duct drop installs directly into exposed Tee 

bar grid system. Thermal Blanket is required (See Thermal Blanket 

Page 1). Connection of ceiling radiation damper, diffuser neck, and 

steel duct drop (See Connection Note Page 1) may be satisfied in two 

1. Ceiling radiation damper and diffuser neck may be connected 

directly to the duct drop (See Detail C) 

-OR- 

2. Ceiling radiation damper may be connected directly to the diffuser 

neck and then the duct drop connected to the damper (See Detail D) 

Figure 3 


Toll free: 800.585.7686 +1.708.552.4040 



Surface Mounted Grilles (Figure 4) 

Maximum size of permitted opening equals maximum size of available 

listed ceiling radiation dampers. Opening in ceiling membrane 

(See Page 1) may be up to one inch larger than the nominal size of 

the ceiling radiation damper (i.e. a 12”x 12” (nominal) ceiling radiation 

damper could have a maximum ceiling membrane opening of 13” 

x 13”). Connection of ceiling radiation damper, grille, and steel duct 

drop may be satisfied in two ways. 

1. Ceiling radiation damper and grille may be connected directly to 

the duct drop (See Detail C) 

– OR – 

2. Ceiling radiation damper may be connected directly to the grille 

and then the duct drop connected to the damper (See Detail D) 

Recess Mounted Grilles (Figure 5) 

If an opening in ceiling membrane is more than one inch larger than 

nominal size of ceiling damper (i.e. if the radiation damper is 12” x 12” 

(nominal), the ceiling membrane opening is larger than 13” x 13”) a 

Thermal blanket is required. 

Connection of ceiling radiation damper, grille, and steel ductdrop 

may be satisfied in two ways. 

1. Ceiling radiation damper and grille may be connected directly to 

the duct drop (See Detail C) 

– OR – 


and then the duct drop connected to the damper (See Detail D) 

Dampers Supported Directly from Structure Above 

Note: Ceiling radiation dampers and grilles may also be supported 

directly from the structure above using one or more of the methods 

described in Figures 6 and 7. When channels are to be used as support, 

they must be 16 ga. x1-1/2” steel channels with 9/16” minimum 

flanges (2 required per damper on opposite sides). Grille flanges must 

overlap the ceiling membrane by a minimum of one inch. 

Refer to guidelines on Page 1 when preparing opening in the ceiling 

membrane and making connections. 






Toll free: 800.585.7686 +1.708.552.4040 



Ducted and Ductless Surface Mounted Grilles (Figure 6) 

Maximum size of permitted opening equals maximum size of available 

listed ceiling radiation dampers. Opening in ceiling membrane 

may be up to one inch larger than the nominal size of the ceiling 

radiation damper (i.e. a 12” x 12” (nominal) ceiling damper could have 

a maximum ceiling membrane opening of 13” x 13”) Connection of 

ceiling radiation damper and grille may be satisfied in three ways: 


and supported by steel channel (See Detail G) 

– OR – 


and supported by hanger straps (See Detail E) 

– OR – 


and supported by direct suspension with wires looped around 

screws through holes in the damper frame before tying (See Detail F) 

Ducted and Ductless Recess Mounted Grilles (Figure 7) 

If an opening in ceiling membrane is more than one inch larger than 

nominal size of ceiling damper (i.e. if the ceiling radiation damper is 

12” x 12” (nominal) the ceiling membrane opening is larger than 13” 

x 13”) maximum size of opening is 24” x 24” (576 sq. in.), a thermal 

blanket is required (See Thermal Blanket Page 1) 

Connection of ceiling radiation damper and air device neck may be 

satisfied in three ways 


and supported by steel channel (See Detail G) 

– OR – 


and supported by hanger straps (See Detail E) 

– OR – 


and supported by direct suspension with wires looped through 

holes in the damper frame before tying (See Detail F) 

Adjustable Control Volume Damper Option (-A) 

When the adjustable volume control damper option is added as an 

accessory to the damper (Butterfly Models Only), then special consideration 

needs to be given to the distance between the damper lower 

frame and the grille it is being mounted to. There needs to be a minimum 

of 1/2” distance between the ceiling damper frame and the grille 

center core (See Detail H). Before installing damper in ceiling, check 

for clearances and freedom of movement of adjustable feature when 

damper is placed on grille. Also check to see that when the link melts, 

that the sides are free to fall to the side and allow the damper blades 

to close. link melts, that the sides are free to fall to the side and allow 

the damper blades to close. 

Special Applications 

NOTE: When it is necessary to install the ceiling damper more than 

3-3/4” from the finished ceiling, an additional application of CK2000- 

1(B) Thermal Blanket is recommended. A strip of CK-2000-1(B) 

Thermal Blanket should be wrapped around the duct drop or damper 

frame (overlapping one inch minimum) to completely insulate the additional 

exposed metal surface, this additional CK- 2000-1(B) material 

must be held in place with suitable steel clamp or 16 SWG steel wire. 





Due to continuing research, MAT reserves the right to change 

specifications without notice. 


Toll free: 800.585.7686 +1.708.552.4040 



Application 

MAT Ceiling Radiation Dampers have been tested, approved, and 

classified by Underwriters’ Laboratories for use in UL Fire Resistance 

Floor-Ceiling and Roof-Ceiling Designs as listed in the UL Fire Resistance 

Directory. These dampers have been approved for, but not limited 

to, wood joist systems incorporating gypsum wall board ceilings. 

Designs specifically tested pertain to UL Designs L501, L502,L503, 

L506, L507, L508, L512, L513, L514, L515, L516, L517, L519, L522, 

L523, L533, L537, and L545, but are not limited to. New UL Ceiling 

designs are constantly being added. Refer to the UL Fire Resistance 

Directory for current approved listings. Metropolitan Air Technology 

ceiling dampers may be substituted into any UL design which incorporates 

a hinge door type damper as outlined in the Fire Resistance 

Directory. 

General Notes 

A. Fasteners must be placed, so not to interfere with the operation of 

the damper. 

B. Classified flex duct must be attached with steel clamps, plastic 

straps, or 18 swg minimum steel wires. 

C. The mounting angles (#8 Below) are to be placed such that ½” leg 

rest on the ceiling materials. 

D. The maximum size damper approved for this installation is 16” 

x12” or 15” diameter. 

E. The insulating material mentioned in #3 below can optionally be 

gypsum secured by 4 sheet metal screws to the top of the metal 

box (#10) and another secured to the floor (#9) the width of the 

joist by damper length plus 4 inches when the damper size is not 

greater than 110 sq. inches. If damper size is greater than 110 sq. 

inches or previous option not used, then an insulating material 

must be supplied by MAT to fully wrap metal box (#10). 

Components 

1. Wood Frame Member or Joist 

2. Ceiling Damper 

3. Insulating Material (See Note E Above) 

4. Grille 

5. Gypsum Wallboard per UL Design number 

6. #8 Screw (min) or 6 Penny Nail 

7. #8 Screw (min) or 3/16” Steel Rivet 

8. 1” x ½” x 20 ga. Steel Mounting Angle 

9. Floor / Roof 

10. Metal Box (22 ga. min., can be supplied by contractor/installer) 

11. Cut opening/transition in box 


Ceiling Damper Installation For Wood-Framed Joist 

With Gypsum Ceilings Models C-S/R-HC (-A) 



Toll free: 800.585.7686 +1.708.552.4040 


Installation of Ceiling Dampers 

A. Measure spacing between framing members. Cut angle to distance 

between members plus six inches. Two full lengths of 1” x½” x 20 

ga. steel mounting angles will be required for each damper. 

B. Cut a slit in the 1” leg, three inches from each end. Bend each end 

of the mounting angle 90°. 

C. Attach the bent section of one of the mounting angles to the wood 

framing member using #8 screws or 6 penny nails. Use a minimum 

of 2 fasteners per bent section. The mounting angles are to be 

placed such that ½” leg rest on the ceiling materials 

D. Attach the ceiling damper to the 1” x ½” mounting angle using 

#8 screws or 3/16” rivets. A minimum of 2 fasteners per angle on 

the square/rectangular damper and one fastener per angle on the 

round damper required. 

E. Position the remaining mounting angle on the opposite side of 

the damper between the joists. Attach one of the 3” bent angle to 

the wood joist with two #8 screws or 6 penny nails. The mounting 

angles are to be placed such that ½” leg rest on the ceiling 

materials. 

F. Attach the ceiling damper to the 1” x ½” angle using #8 screws 

or 3/16” rivets. A minimum of 2 fasteners per angle on the square/ 

rectangular damper and one fastener per angle on the round 

damper required. 

G. Attach the remaining end of the 3” bent angle to the wood joist 

with two #8 screws or 6 penny nails. 



Metropolitan Air Technology’s Recommendations For Periodic 

Inspection, Testing & Maintenance Of Fire, Smoke, Air Control 

& Other Life Safety Dampers 

MAT 


Toll free: 800.585.7686 +1.708.552.4040 


P-102 Page 1 of 6 © 2012 Metropolitan Air Technology. All rights reserved. 7/12


Inspection, Testing, & Maintenance of Fire Dampers, Smoke 

Dampers, Combination Fire Smoke Dampers, Ceiling Dampers, & Air 

Control Dampers 


Toll free: 800.585.7686 +1.708.552.4040 


© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-102 Page 2 of 6






Toll free: 800.585.7686 +1.708.552.4040 



MAT 






Toll free: 800.585.7686 +1.708.552.4040 


© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-102 Page 4 of 6 

MAT





MAT 

MAT 


Toll free: 800.585.7686 +1.708.552.4040 



MAT 






Toll free: 800.585.7686 +1.708.552.4040 


© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-102 Page 6

Xx 

Xx 



Xx 

Xx 


© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-104

Xx 

Xx 



Xx 

Xx 


© 2012 Metropolitan Air Technology. All rights reserved. 7/12 P-106

Volume Control Dampers Remotely Operated Balancing Dampers ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?