A4 Grilles - Linear Bar.qxd - Scottaire

GRILLES-Linear Bar 

LINEAR BAR 

GRILLES 

A range of linear bar grilles with horizontal 

blades at either 0°, 15 °, 30° or 45° deflection and fixed 

or removable cores. Usually used in sidewall applications, 

but they are also designed to be used in ceilings or, 

in the case of the 0° and 15° deflection, for light floor duty. 

Standard. Details of the standard blade spacing, angles of 

deflection and frame types with the appropriate model 

references are shown on pages 22, 23 and 24. 

STANDARD SPECIFICATION 

STANDARD SPECIFICATION 

SIZES 

Sidewall Use 

(Fixed core only or removable cores). The nominal 

duct size can be any length from 100mm to 2000mm 

in one piece and height in increments equivalent to the 

blade spacing from 50mm to 1200mm. A run longer 

than 2000mm can be made up to any length by 

manufacturing the grille in sections provided the 

nominal height is not more than 600mm. The sections 

will butt up to each other to give a continuous 

appearance. Alignment plates (Code 0398) are 

provided for the borders on multiple section grilles. 

Ceiling Use 

Fixed cores 

The nominal duct size can be any length from 100mm 

to 2000mm in one piece and height in increments 

equivalent to the blade spacing from 50mm to 

600mm. A run longer than 2000mm can be made up 

to any length by manufacturing the grille in 

sections. Alignment plates (Code 0398) for the 

borders are provided for multiple section grilles. 

Removable cores 

Any nominal length from 100mm to 1000mm in one 

piece and any height from 50mm to 600mm in i 

ncrements equivalent to blade spacing. A run longer 

than 1000mm can be made up to any length by 

manufacturing the grille in sections provided the 

nominal height is not more than 600mm. The sections 


appearance. Alignment plates (Code 0398) for the 


Lay in Cores 

Same as for the removeable cores above except that 

maximum length is limited to 1000mm, as on Grille. 

It is essential that any ceiling mounted linear grilles 

with re-movable or lay in cores are fitted with safety 

wires.These limitations on size are imposed for safety 

reasons. 

Floor Use 

(Fixed or lay in cores only) The nominal duct size 

can be any length from 100mm to 2000mm in one 

piece and the height from 50mm to 300mm in 

increments equivalent to the blade spacing. A run 

longer than 2000mm can be made up to any length 

by manufacturing the grille in sections. The sections 


appearance. Alignment plates (Code 0647) for the 


CONSTRUCTION 

Aluminium with mechanical joints to lock the 

mitred corners. 

CORE STYLES 

The cores are either fixed, removable/lay in or core 

only. The removable cores are retained by either 

spring loaded buttons or horseshoe clips on the 

cross mullions when mounted in the vertical and by 

horseshoe clips or laying the core in the frame when 

mounted in the horizontal. See following pages for 

details of the core styles and codes. 

FINISH 

Silver satin anodised to BS1615 AA5. 

FIXINGS 

All codes, except the flangeless and spring location 

clip models, have countersunk screw holes in the 

border. Size no. 6 x 1 1 /2˝ self tapping screws 

provided with each grille and painted the same 

colour as the grille. (Fixing type 0F1) See Fixing 

Methods section for screw fixing centres. The 

flangeless models, except when floor mounted and 

supported under the frame, require a removable 

core and are fixed through the stack of the grille 

(Fixing type 0F7) and spring location clip models 

have un-punched borders and are located by spring 

clips. (Fixing type 0F8) It is important to make 

clear when ordering if you do not require 

fixing holes in the border, particularly if you are 

ordering a removable core model and want to use 

concealed fixing. 

G20


OPTIONAL ALTERNATIVES/ADDITIONS 

PAN ADAPTORS, PLENUM & HEADER BOXES 

PACKAGING 

Each grille is individually shrink wrapped in 

polythene with additional cardboard support to the 

faces. Alignment plates are attached to one section 

in a linen draw-string bag. 

TECHNICAL INFORMATION 

See page 28 

SIZES 

Non standard sizes. We are not able to manufacture 

sizes other than those shown under the standard 

specification. 

DAMPERS 

Opposed blade damper. A clip on opposed blade 

damper (Code 0106) can be fitted, provided the 

nominal height does not exceed 450mm. The 

exceptions are all the fixed core linear grilles that 

have a blade pitch of 6.25mm and the 45° deflection 

with a blade pitch of 12.5mm because it is not 

possible to access the damper operator on these 

particular models, unless the core is removable. 

Dampers cannot be fitted to ceiling mounted lay in 

models either. 

FINISHES 

Any BS, RAL or NCS colour. Code 0145. Please 

specify the colour reference. We suggest powder 

coating on top of anodising for swimming pool 

applications. It may also be possible to anodise to 

alternative finishes for substantial quantities. 

Details on request. 

FIXINGS 

Concealed fixings / sub-frames are available. (Fixing 

type OF3) See Fixing Methods section. Please make 

sure that if you are fixing the grille by concealed 

methods, you order the grille with un-punched 

borders. The 0 in the product code becomes 9. 

MITRED CORNERS 

Angled mitred corners. Any angled corner section can 

be manufactured from 40° to 179°. See page G27 for 

Codes and details. 

2 WAY DISCHARGE 

Two way blow. Most of the 15°, 30° and 45° 

models can be made as two way opposite blow with 

the blades parallel to the long dimension. The first 

figure in the code would be 9 not 0. Please contact 

Head Office for details. 

SAFETY WIRES 

Safety wires (Code 0379) can be provided to attach 

the core to the border, where the core is removable, 

in order to minimise the possibility of accidents. 

They are fitted as standard on ceiling mounted 

removable core models. 

(Un-insulated) 

Top entry pan adaptor without flange (120mm high)*. Code 0323. 

Top entry pan adaptor without flange (17mm high). Code 0338. 

This height of pan adaptor should only be used where the spigot 

diameter plus 50mm is equal to or greater than the largest nominal 

dimension of the pan and the grille does not have a damper fitted 

to it. 

Top entry pan adaptor with flange*. Code 0328. 

Side entry plenum flange for use on single grilles up to and 

including 2 metres in length*. Code 0335. 

Side entry plenum with flange for use on single grilles up to and 

including 2 metres in length*. Code 0324. 

Side entry header box without flange for use on continuous runs 

over 2 metres long without opposed blade dampers. Code 0350. 

Side entry header box without flange for use on continuous runs 

over 2 metres long with opposed blade dampers. Code 0362. 

Side entry header box with flange for use on continuous runs over 

2 metres long without opposed blade dampers.Code 0363. 

Top entry header box with flange and flush fitting end caps 

for use on continuous runs over 2 metres long without dampers. 

Code 0374. 

Top entry header box with flange and flush fitting end caps for use 

on continuous runs over 2 metres long with dampers. Code 0364. 

Items with an * can be used on grilles with or without an opposed 

blade damper. 

Please see Sheet MetalWork section for details and codes for top 

entry plenum and header boxes, additional spigots and insulation 

for plenums and header boxes that are available. 

Pan adaptors, plenum boxes and header boxes can be fitted with 

quadrant dampers for either manual (Code 0483) or cord operated 

(Code 0484) control. 

We can also design boxes with non standard heights where there is 

limited space above the ceiling or in the cavity. 

ORDERING DETAILS 

• The code for the basic product should have at least 

13 digits. See page 1. 

• Please always give the length first then the height. 

• Add Codes for additions / alternatives as suffixes. 

• Please make sure you order un-punched borders if you 

order concealed fixings. 

EXAMPLE: 

A linear grille to fit an opening 2300mm long x 

200mm high having 15° deflection blades, a removable 

core retained by horse-shoe clips, opposed blade 

damper, pan adaptor without flange, to be concealed fix 

through the stack of the grille and painted 

RAL 9010 satin would be coded:- 

0237/02300/0200+0106+0323+0145-RAL 9010 

satin, + OF2. 

(un-punched borders). 

Applications. Supply * Extract * Sidewall * Ceiling * 

Floor * Transfer * 

G21


3.3mm Blades with 0° Deflection 

18.75 

18.75mm Centres. 

FLANGED. 

Code 0221 Fixed Core. 

Code 0384 Fixed Core. Spring Location Clips. 

Code 0402 Core Only. 

Code 0228 Removable Core Spring. Spring button. 

Code 0235 Removable Core Spring. Spring Clip. 

Code 0242 Removable Core, Lay-in. 

30mm clearance required above core. 

Code 0512 Floor Frame Fixed Core.* 

Code 0516 Floor Frame with lay-in Core.* 

RECESSED. 

Code 0452 Fixed Core.* + Sidewall or Ceiling 

Code 0453 Lay-in Core.* Floor 

Code 0624 Removable core. Spring Button. 

Code 0674 Fixed Core Floor.* + 

* Need to be supported under frame when used in the floor. 

+ Fixing only through the back of the stack or with duct straps. 

FREE AREA APPROXIMATELY 70% OF DUCT CONNECTION 

Sidewall 

Suggested Uses 

Ceiling 

Light 

Floor 

Convector 

Casings 

Can OBD 

be Fitted 

Safety Wires 

required if 

fitted in 

ceiling 

3 3 3 3 

3 3 

3 

3 3 3 3 3 

3 3 3 3 3 

3 3 3 

3 3 

3 3 

3 3 3 3 

3 3 3 

3 3 3 3 3 

3 3 

6.25 


FLANGED. 






Code 0243 Removable Core, Lay-in Removable Core. 




RECESSED. 

Code 0450 Fixed Core.*+ Sidewall & Ceiling 

Code 0451 Lay-in Core. Floor 



* Need to be supported under frame. 



Sidewall 


Ceiling 

Light 

Floor 

Convector 

Casings 

Can OBD 

be Fitted 

Safety Wires 

required if 

fitted in 

ceiling 

3 3 3 

3 

3 

3 3 3 3 3 

3 3 3 3 3 

3 3 3 

3 

3 3 

3 3 3 

3 3 3 

3 3 3 3 

3 

12.5 


FLANGED. 






Code 0238 Removable Core, Lay-in Removable Core. 




RECESSED. 

Code 0462 Fixed Core.*+ Sidewall & Ceiling 

Code 0463 Lay-in Core. Floor 






Sidewall 


Ceiling 

Light 

Floor 

Convector 

Casings 

Can OBD 

be Fitted 

Safety Wires 

required if 

fitted in 

ceiling 

3 3 3 3 

3 3 

3 

3 3 3 3 3 

3 3 3 3 3 

3 3 3 

3 3 

3 3 

3 3 3 3 

3 3 3 

3 3 3 3 

3 3 

G22



15° 

12.5 


FLANGED. 




Code 0231 Removable Core. Spring Button. 

Code 0237 Removable Core. Spring Clip. 

Code 0244 Removable Core. Lay-in. 



Code 0517 Floor Frame Lay-in Core.* 

RECESSED 

Code 0458 Fixed Core.*+ 

Code 0459 Lay-in Core 

Code 0625 Removable Core. Spring Button 





Sidewall 


Ceiling 

Light 

Floor 

Convector 

Casings 

Can OBD 

be Fitted 

Safety Wires 

required if 

fitted in 

ceiling 

3 3 3 3 

3 3 

3 

3 3 3 3 3 

3 3 3 3 3 

3 3 3 

3 3 

3 3 

3 3 3 3 

3 3 

3 3 3 3 

3 3 


30° 

12.5 


FLANGED. 


Code 0392 Fixed Core. Spring Location Clips 



Code 0252 Removable Core. Spring Clip. 

Code 0254 Removable Core Lay-in. 


RECESSED 


Code 0626 Removable Core. Spring Button 



Sidewall 


Ceiling 

Light 

Floor 

Convector 

Casings 

Can OBD 

be Fitted 

Safety Wires 

required if 

fitted in 

ceiling 

3 3 3 3 

3 3 

3 

3 3 3 3 3 

3 3 3 3 3 

3 3 3 

3 

3 3 3 3 

3 3 3 3 3 


45° 

12.5 


FLANGED. 





Code 0233 Removable Cor.e Spring Clip. 

Code 0239 Removable Core. Lay-in. 

30mm Clearance Required Above Core. 

RECESSED 

Code 0627 Removable Cor.e Spring Button. 





Sidewall 


Ceiling 

Light 

Floor 

Convector 

Casings 

Can OBD 

be Fitted 

Safety Wires 

required if 

fitted in 

ceiling 

3 3 3 

3 

3 

3 3 3 3 3 

3 3 3 3 3 

3 3 3 

3 3 3 

3 

G23



45° 

18.75 


Flanged. 




Code 0227 Re-movable Core. Spring Button. 

Code 0234 Re-movable Core. Spring Clip. 

Code 0240 Re-movable Core. Lay-in. 

30mm Clearance Required Above Core. 

RECESSED 


Code 0673 Re-movable Core. Spring Button. 


+ Fixing only through back of the stack or with duct straps. 


Sidewall 


Ceiling 

Light 

Floor 

Convector 

Casings 

Can OBD 

be Fitted 

Safety Wires 

required if 

fitted in 

ceiling 

3 3 3 3 

3 3 

3 

3 3 3 3 3 

3 3 3 3 3 

3 3 3 

3 3 3 3 

3 3 

3 3 3 3 3 

Model shown is Code 0511 + 0106 

0° Linear Grille in a Flanged Floor Frame, fitted with Damper 

If Lay-in Core is Required, Code becomes 0515 +0106 

23.5 

Overall = D + 35mm 

4 

20.5 

36 

78 

15 Max Clearance 

Over Stack = D - 2mm 

Opening Size = D 

For grille lengths less than and including 2m. 

The frame would be made in one section as below. 

2000mm Max. 

300mm Max Centres 

For grille runs greater than 2m but less than 4m, 

grille would be made in 2 equal sections as below 

Equal 

Equal 

For grille runs greater than 4m the length is divided 

The nearest number of equal sections below 2m long. 

Equal Equal Equal 

No end border fitted when 

part of a continuous run 

Mullions fitted inside 

2m Max Length in 1 Section 

G24


25 

2.5 

D + 35mm 

12.5 

11.5 

6 

1.5 

12.5 

23.7 

3.5 

22.5 

67 

D + 35mm 

D 

23.5 

68 

D = Nominal Duct size 


Linear Bar Grille with fixed core, blades with 

0° deflection on 12.5mm centres and fitted 

with Opposed Blade Damper 



Linear Bar Grille with 0° deflection blades on 

12.5mm centres. Removable core retained by 

Button Fasteners and fitted with Opposed Blade Damper 

23.5 

68 

D 

D - 2mm 

30mm Min. Clearance 

For Core Removal 

22.5 

23.7 

12.5 

D + 43mm 

27.7 

12.5 

D + 35mm 

D 


Model shown is Code 0238 

Linear Bar Grille with 0° deflection blades 

On 12.5mm centres with Lay-in removable core 

D 

D + 0.5mm 

Pitch 

2.7 

X 

19.5 



Linear Bar Grille with 0° deflection blades on 

12.5mm centres. Removable core retained by 

Horseshoe Spring Clips. Fitted with Opposed 

Blade Damper 

Code 0401 core only Linear Bar Grille 0° deflection blades on 

12.5mm Centres 

Standard sizes for the D dimension should be in 12.5mm increments 

Some intermediate aizes can be made by adjusting dimension X 

Contact Head Office for details 

D + 35mm 

100 Min. 

4.5 

23.5 

D + 10mm 


Linear Grille with access door 

Suffix Code 0248 on Linear Model 

G25



Model shown is Code 0462 +01060 

Linear Bar Grille 0° deflection blades on 12.5mm centres with fixed 

core 

In a Recessed Flangeless Frame with Opposed Blade Damper. 

NOTE - the core can be Lay-in if the floor code becomes 0463 

5 

D 

D - 2mm 

12.5 

24.5 

40 

82 

15 

15 

For grille lengths less than and including 2m. 

The frame would be made in one section as below. 

2000mm Max. 

For grille runs greater than 2m but less than 4m, 

Grilles would be made In 2 equal sections as below 

Equal 

Equal 

For grille runs greater than 4m the length is divided into 

The nearest number of equal sections below 2m long. 

Equal Equal Equal 

Mullions fitted inside 

No end 

border 

fitted 

when 

part of a 

continuous 

run 

300mm Max Centres 

2m Max Length in 1 Section 

40 

81.5 

1 5 

5 

2.5 

D + 35mm 

12.5 

25 

22.5 

67 

12.5 

D - 2mm 

D 

D 



Linear Bar Grille With 0° deflection blade on 12.5mm 

centres with fixed core, located in a horizontal surface by 

Spring Location Clips. Fitted with an Opposed Blade 

Damper. (Unpunched borders as standard) 

Not to be used in ceiling or vertical surfaces 


Model shown is Code 0622 +0106 

Recessed Frame Linear Bar Grille 0° deflection blades on 

12.5mm centres 

Removable core retained by Button Fasteners and fitted 

with Opposed Blade Damper 

Caution: Fixing this type of frame with a fixed core is not 

possible. 

G26


Linear Grille Mitred Corner 

Code 0464 0° deflection blades on 6.25mm centres 







90° 

300 Inside 

Opening = Nominal Grille Height + 317.5mm 

300 Inside 

Opening = Nominal Grille Height + 317.5mm 

Use Formula 

Nom Opening 

Use Formula 

300 Inside 

300 Inside 

Nom Opening 

To Calculate The Outside Length For Any Angle Other Than 90°, Use The Formula Below 

First Calculate The Angle Of The Cut = (180 - ) divided by 2 

Then The Outside Opening Length = [ (Nominal Opening + 17.5mm) x Tan of The Angle Of Cut ] + 300mm 

e.g. Assume Nominal Dimension = 300mm and = 135° then angle of cut = (180 - 135) / 2 = 22.5° 

Outside Opening Length = [ (300 + 17.5mm) x Tan 22.5° ] + 300 = 431.5mm 

G27


PERFORMANCE DATA FOR 

LINEAR GRILLES 

• This nomogram is based on Code 217 Linear 

Grilles and corrections should be applied for other 

codes. In the case of Linear grilles, the fixed parameters 

for selection are usually volume, throw and/or 

width of grille. To select for the volume and throw, the 

volume should be related to a metre run. For example, 

if the length is to be 500mm and the volume 0.15m 3 /s, 

then volume per metre would be 1 ÷ 0.5 x 0.15 = 

0.3m 3 /s/. If the required throw is 7 metres, place a 

ruler on the volume line at 0.3 and cross the throw 

line at 7 metres. The rule crosses the width line at 

275mm. If there is a limitation on the width of the 

grille, say 200mm wide in the above case, and the 

throw was critical, then the length would have to be 

increased. Design throws should always be corrected 

using tables 1, 2, 3 and 4 as appropriate, before 

entering the nomogram. Pressure drop and NR 

should be corrected after using the nomogram. 

PERFORMANCE DATA 

TABLE 1 

Corrections for 

other Grilles 

Data given is for isothermal conditions and for free space application. 

No opposed blade damper. For dampers add 40% to the pressure drop and 5NR. 

Grille 

Type 

116 

117 

118 

119 

Pressure 

Correction Factors 

x 1.1 

x 1.0 

x 1.2 

x 1.4 

Sound 

Factors 

÷3 

x 1 

÷ 4 

÷ 10 

Throw 

Factors 

x 1 

x 1 

÷ 0.95 

÷ 0.95 

Volume (Q) 

m 3 /s/ metre run 

2.0 

Nominal Grille 

Width mm x 1000mm long 

222 

229 

236 

243 

217 

225 

232 

238 

221 

228 

235 

242 

230 

231 

237 

244 

251 

253 

252 

254 

218 

226 

233 

239 

219 

227 

234 

240 

x 1.2 

x 1.2 

x 1.2 

x 1.2 

x 1.0 

x 1.0 

x 1.0 

x 1.0 

x 0.8 

x 0.8 

x 0.8 

x 0.8 

x 1.1 

x 1.1 

x 1.1 

x 1.1 

x 1.2 

x 1.2 

x 1.2 

x 1.2 

x 1.3 

x 1.3 

x 1.3 

x 1.3 

x 1.2 

x 1.2 

x 1.2 

x 1.2 

÷ 4 

÷4 

÷4 

÷ 4 

x 1 

x 1 

x 1 

x 1 

÷4 

÷ 4 

÷4 

÷4 

÷3 

÷3 

÷ 3 

÷3 

÷10 

÷10 

÷10 

÷ 10 

÷15 

÷15 

÷15 

÷15 

÷10 

÷10 

÷10 

÷ 10 

÷ 0.95 

÷ 0.95 

÷ 0.95 

÷ 0.95 

x 1 

x 1 

x 1 

x 1 

÷ 0.95 

÷ 0.95 

÷ 0.95 

÷ 0.95 

÷ 0.95 

÷ 0.95 

÷ 0.95 

÷ 0.95 

÷ 0.82 

÷ 0.82 

÷ 0.82 

÷ 0.82 

÷ 0.70 

÷ 0.70 

÷ 0.70 

÷ 0.70 

÷ 0.70 

÷ 0.70 

÷ 0.70 

÷ 0.70 

1.5 

1.0 

0.9 

0.8 

0.7 

0.6 

0.5 

0.4 

0.3 

0.2 

0.15 

20 

10 

8 

7 

6 

5 

4 

3 

2 

Pressure drop 

(∆Pt ) Pa 

60 

50 

40 

30 

20 

NRLW 

50 

40 

30 

20 

10 

6.0 

5.0 

4.0 

3.0 

2.5 

2.0 

1.5 

1.0 

Duct 

velocity 

m/s 

100 

150 

200 

250 

300 

350 

400 

450 

500 

550 

600 

TABLE 2 

Corrections to throw 

due to ceiling. 

Grille more than 

600mm from ceiling 

Grille more than 

600mm from ceiling 

0 

0 

TABLE 3 

Throw corrections 

for length 

Grille Length (m) Factor 

0.66 - 1.00 - 

1.66 - 2.00 +1.1 

› 2.01 +1.2 

0.1 

0.09 

0.08 

0.07 

0.06 

0.05 

1 

Throw in metres. 

Terminal Velocity 

(Vt) 0.25m/s 

0.04 

TABLE 4 

Throw corrections 

for other (V t ) 

TABLE 5 

Sound corrections 

for length 

0.03 

Terminal Velocity Factor 

0.25 m/s + 1.0 

0.375 m/s +0.67 

0.5 m/s +0.5 

Grille Length (m) Factor 

0.33 - 1.00 - 

1.01 - 1.66 +1 NR 

1.67 - 2.00 +2 NR 

2.30 - 3.00 +3 NR 

0.02 

G28

A4 Grilles - Linear Bar.qxd - Scottaire

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