DAL 358 - NAD Klima

Catalog 1.1.1 

Swirl diffuser 

DAL 358

Concordia University, Montréal, Canada

NAD Klima 

DAL 358 model 

DAL 358 1 


Method of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DAL 358 3 

Flow and direction of the air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DAL 358 5 

Range of application and Quick selection . . . . . . . . . . . . . . . . . . . . . . . . DAL 358 6 

Diagrams of performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DAL 358 7 

Dimensions and Weight . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . DAL 358 11 




content 

1.1.1 DAL 358 C

Cafeteria, CIMA+ ing. , Sherbrooke, Québec


Swirl Diffuser 

Description, Areas of application and Benefits 

DAL 358 Swirl diffuser 

The DAL 358 is a high induction swirl 

airflow diffuser with a circular or 

square front plate. It has eccentric 

ABS cylinders and profiles controlling 

air stream. 

The DAL 358 permits optimal adaptation 

of the ventilation system to 

prevailing room requirements. 

Eccentric cylinders integrated into 

the front plate permit a variety of 

airstream configurations, even after 

installation. 

The DAL 358 technology provides 

high speed discharge air with relatively 

low sound power. 

The swirl airstream, the stability and 

the high induction generated from 

the very start of the discharge slot 

make the DAL 358 the diffuser of 

choice for high air flow rates and 

variable air volumes. 

Areas of application 

-High flow rate zones 

-Comfort zones 

-Offices with closed work spaces 

-Offices and clean rooms 

-Administrative centres 

-Computer(class-)rooms 

-Meeting rooms 

-Multi-purpose rooms 

-Systems with constant or variable 

airflow rates 

-Entrance halls (vertical air blast) 

Product benefits 

- Rapid reduction of speeds and 

temperature variations caused by 

high induction 

- Low sound power for high air flow 

rates 

- Stable swirl airflow and a variety of air 

blasts available in 1-2-3 directions 

- Eccentric cylinders allowing 1800 air 

blast adjustment 

- Possibility of changing airflow, even 

after installation 

- Possibility of reducing total airflow 

rate as much as 25% in VAV 

- Three times as much induction 

as a conventional 4-way diffuser 

- Possibility of eliminating peripheral 

heating due to diffuser heating 

- Fewer diffusers required 

- Possibility of reducing total air 

volumes of the various units, while 

meeting requirements 

in air mix quantity 

- Possibility of adapting to systems 

requiring constant or variable airflow 

rates 

Subject to technical changes. Version 04 / 06 / 2012 

1.1.1 DAL 358 1



DAL 358 Configuration 

Whether on a square or circular front 

plate, the slots for the eccentric 

cylinders are generally arranged in a 

star pattern. 

DAL 358-Q-300/400 


DAL 358-R-300 

The diffuser is mounted on a plenum. 

Up to a nominal size of 800, the front 

plate is secured by a concealed 

middle screw. In the case of the DN 

60 however, a reinforcement crossbar 

is required to secure the plate. 

Only the DN 800 has a different fastening 

configuration; screws are fastened 

at the 4 corners of the plate 











2 1.1.1 DAL 358 

Subject to technical changes. Version 23 / 08 / 2012



Method of operation 

The eccentric cylinders, 100 mm in 

length, can pivot a full 3600. In their 

initial position, (1A and F6), the 

airflow will deviate by 900 with a 

constant discharge blast . Turning 

the cylinders to positions 2 1 and 6 5, 

for example, will reduce the section 

without tapering off and the air blast 

will increase. Adjustments 2 1 and 6 

5 are standard for North America 

because of the multiple VAV applications 

(variable air volume). 

The eccentric cylinder, aided by the 

profiles of the slots, creates a powerful 

channel into which the air is 

drawn. When nearing the exit of the 

cylinder, air depression takes place. 

Air Flow Behaviour 

The DAL 358 frontal plate has slots 

arranged in a characteristic star 

pattern. Turning the cylinders individually 

can produce a multitude of 

airstream patterns. In this manner, 

obstacles to efficient air flow can be 

avoided (lamp bases, ceiling drops, 

architectural columns, etc....). When 

installing in high ceilings (>5 m), a 

portion of the cylinders in the centre 

of the slot must be directed to 

produce a vertical blast (see figure 1). 

Use of the DAL 358 does not require 

a closed ceiling installation in order 

to produce a stable horizontal 

airflow. Despite the variety of air flow 

directions, all shapes have more or 

less the same sound power and 

pressure drop because of the specific 

design of the eccentric cylinder . 

Controlling the direction of airflow 

Air flow 

Indexing range 

min. max. 

Direction of airflow 

Cylinder position 1A 

Cylinder position 2 1 

Cylinder position 4 3 

Swirl air blast 

When positioning all the cylinders on 1 

A, a rotating air blast under the ceiling 

is produced in a swirling stream, 

creating a strong induction current. 

(standard setting). 

One-Sided Blast 

This air flow is obtained by positioning 

all of the cylinders on 1 A. 

Two-Sided Blast 

This blast on two sides is obtained by 

positioning all cylinders of one half on 

1A and those of the other half on F6. 

Cylinder position CD 

Schema 1 



CIMA+ ing. , Sherbrooke, Québec



Vmax = Vmax simulation X f 

∆Pt = ∆Pt simulation X f 

LWA[dB] = LWA[dB] simulation X f 

Flow and Direction of the air 

DN 600 360° helical flow 

ST = Standard helical flow (2 1) 

HL = Flow high-rise (>5m) 

(exterior 21 and center C D ) 

VF = Vertical flow (C D) 

DN 300 

DN 600 180° 3-way helical 

3W = Flow 180° (wall) (2 1 - 3 4) 

DN 300 

DN 400 

DN 400 

DN 500 

DN 500 

DN 600 

Position 4 3 

Position 2 1 

DN 600 

Correction factor : f 

V MAX 1.0 

∆Pt 1.0 

L WA [dB] 1.0 

DN 800 


V MAX 1.2 

∆Pt 1.3 

L WA [dB] 1.1 

DN 800 

DN 600 3-way 90˚ 

3C = Flow 90° (corner) (2 1) 

DN 300 

DN 600 2 -way corner 

2L = Flow on both side by L 

(2 corridors) (2 1) 

DN 300 

DN 400 

DN 400 

DN 500 

DN 500 

DN 600 

DN 600 


V MAX 1.4 

∆Pt 1.0 

L WA [dB] 1.0 

DN 800 


V MAX 

∆Pt 

L WA [dB] 

1.7 

1.0 

1.0 

DN 800 

DN 600 2 opposite ways DN 600 1 way 

DN 300 

2W = Flow on two opposite sides (2 1 - 5 6) 

1W = Flow on one side (2 1) 

DN 300 

DN 400 

DN 400 

DN 500 

DN 500 

DN 600 

DN 600 


V MAX 1.7 

∆Pt 1.0 

L WA [dB] 1.0 

DN 800 


V MAX 

∆Pt 

L WA [dB] 

2.0 

1.0 

1.0 

DN 800 





Range of application - Quick selection for DAL 358 

Height of 

the room 

Air flow by surface 

m 3 /h/m 2 

cfm/sq ft 

Nominal 

size 

DN 

Quantity of 

diffusers 

Airflow by diffuser 

m 3 /h 

cfm 

Min. distance 

diffuser 

(m) 

Min. distance 

wall 

(m) 

Critical 

X 

(m) 

Pressure 

difference 

∆P (Pa) 

Acoustic 

Power level 

Lw(dBA) 

9 0.5 DN 400 4 228 134 1.3 0.7 1.4 25 36 

2.44 m 

(8 ft) 1 

15 

27 

37 

2 

0.8 

1.5 

2 

DN 500 

DN 600 

DN 600 

3 

4 

4 

6 

366 

660 

609 

215 

388 

358 

2.2 

4.2 

3.5 

6 

1.2 

2.2 

1.8 

7 

1.4 

1.9 

1.7 

25 

32 

26 

36 

43 

39 

9 0.5 DN 400 4 228 134 0.2 0.1 1.4 25 36 

3.05 m 15 0.8 DN 500 4 366 215 0.8 0.5 1.4 25 36 

(10 ft) 

27 1.5 DN 600 4 685 403 2.8 1.5 1.9 32 43 

37 2 DN 600 6 609 358 2.2 1.2 1.7 26 39 

9 0.5 DN 500 2 457 269 0.1 0.1 1.7 36 42 

4.0 m 

(13 ft) 

15 

27 

0.8 

1.5 

DN 500 

DN 600 

4 

4 

366 

685 

215 

403 

0.1 

0.8 

0.1 

0.6 

1.4 

1.9 

25 

32 

36 

43 

37 2 DN 800 4 914 537 1.6 0.9 1.8 28 44 

**Lw(dBA) : The absorption of the room is not considered. Column for any room from that height at the same volume of air by diffuser 

Column in reference to the example 

Specifications : 

- Room: L x W x H = 10 m x 10 m x 2.44m 

( 33 ft x 33 ft x 8 ft) 

- Total air flow in the room : 1550 cfm 

4 

- Initial temperature difference: ∆T = -10°C 

- Air velocity : 1.8 m = 0.25 m/s (50 cfm) 

- VAV : 25% 

Using the data on ceiling height 1 and airflow 

rate by surface (m 2 or sq. ft. 2 ), 2 choose the 

nominal size (DN) of the DAL 358. 3 

Divide the total airflow rate of the room 4 by 

the ideal value of the air flow rate for the 

selected size. Adjust the quantity of diffusers to 

achieve symmetry in the room while respecting 

the maximum airflow rate in the optimal setting 

range. 5 Watch for minimal distance between 

diffusers and between diffusers 6 and walls. 7 

Connector diameter 

ød 

mm inches 

Location of the diffusers 

= minimum range of application 

= Optimal range of application 

(For minimum application in V.A.V.) 

(Maximum standard volume for 

office building) 

1.8 m (6 ft) Y 

Airflow pattern 

comfort line 

Scale grid: 1 m Blue: Air velocity >= 0.25 [m/s] 

= Maximal range of application 

(Noise level higher than 33 (43-10) dBA) 

300 12 DN 800 

opt 

540* 

250 10 DN 600 

opt 360* 

5 

200 8 DN 500 

opt 

240* 

150 6 DN 400 

opt 

130* 

150 6 DN 300 

opt 65* 

* Ideal operating value in cfm 

cfm 

L/s 

m /h 

Airflow 

20 30 40 50 60 70 80 100 

150 200 280 300 350 400 500 600 1000 

10 15 20 24 28 33 37 47 70 94 132 142 165 188 235 

283 472 

34 51 68 85 102 119 136 170 255 340 475 510 595 680 850 1020 1700 

V . Subject to technical changes. Version 10/ 04 / 2013 

6 1.1.1 DAL 358



Stream rating diagram 

Notes : 

Room absorption is not factored in. 

For a comparison with North American values, 

reduce sound power by 10. 

Flow sub-ceiling 

Airflow V· 

CFM 

92 

[m /h] 

25 30 35 40 45 55 60 = L WA [dB(A)] 

2 

= L WA [dB(A)] 

= L WA [dB(A)] 

1 3 

L WA [dB(A)] = 

L WA [dB(A)] = 

Airflow distance after conjunction (y [m]) 

11.5 10 8 6.5 5 3.25 

5 

1.5 0 Ft 

33 

in./H 2 O 

Pressure loss Pt [Pa] 

.04 

.08 

4 

.12 

.16 

.20 

.24 

.28 

.32 

.36 

.40 

29.5 

26 

23 

20 

16 

20 

m/s ft/min 

13 

30 

40 

10 

7 

60 

6 

8 

6.5 

5 

3.25 

Airflow distance x [m] 

Airflow velocity v max 

80 

100 

120 

140 

160 

180 

200 

DAL 358 - 8 





Airflow performance diagram and Example 

Critical airflow distance 

DN400 et DN300 

Critical airflow distance x crit [m] Critical airflow distance x crit [m] 

10 

DAL 358 - DN 400 / 300 

Airflow V· 

Airflow V· 

∆T 

Temperature difference 

(0) (100) (200) (300) (400) (500) 

Critical airflow distance x crit [m] 

[m /h] Airflow V· 

∆T 


°C 

°C 

°C 

°C 

°C 

°C 

°C 

°C 

°C 

°C 

x crit [m] (DN300) 

Critical airflow distance x crit [m] 

[m /h] Airflow V· 

DAL 358 - DN 500 

[m /h] 

[m /h] 

∆T 


DAL 358 - DN 600 DAL 358 - DN 800 

∆T 


°C 

°C 

°C 

°C 

°C 

°C 

Temperature ratio 

°C 

°C 

°C 

°C 

Specifications : 

Height of ceiling: 

H= 3.00 m 

Airflow rate by diffuser: V O = 600 m3/h 

Maximum cooling: 

∆T 0 = -10°C 

Distance between diffusers: 2 x 1.7 = 3.4m 

Requirements: 

1. Nominal size of diffuser 

2. Sound power L WA 

3. Pressure drop ∆pt 

4. Maximum air velocity at nominal head 

level (1.8 m) 

5. Maximum temperature variation of 

ambient air at nominal head level 

6. Critical path of airflow (blast detaching 

itself from ceiling when cooling) 

Solution: 

1.From diagram" Range of Applications" 

we note the nominal size of DN600 1 

2, 3. From diagram "Airflow from Ceiling" 

for the DN 600 as diffuser and an airflow rate 

of 600 m3/h 2 we note the following values: 

Sound power: 39dB 3 (29 dB when factoring 

in room absorption) 

Total pressure drop: 25 Pa 4 

4. At nominal head level 

y = H - 1.80 = (3.00 m - 1.80 m = 1.20 m) 

and a horizontal airflow path of 

x-1.7 m 

0.18 m/s 

6 

7 

we note a maximum air velocity of 

5. For an airflow distance of 

(x+y) = 1.70 m + 1.20 m = 2,90 m 8 

and a DN 600, we note a temperature ratio of 

0.062°C 9 . The maximum temperature 

variation reached between room air and air 

blast at head level is 0.062 x 10°C = -0.62°C. 

5 

9 

6. From diagram "Critical Distance of Airflow" 

and an airflow rate of 600 m3/h with an initial 

temperature variation of ∆T0 =-10°C 

we come to a critical distance of airflow Xcrit 

= 1.7 m. 10 

∆Txy 

∆T 

8 

300 

x bzw. x + y [m] 



Laval University, Québec, Canada

TVA, Montréal, Canada



Dimensions 

DAL358 Dimension / Weight Square plenum DAL358 Dimension / Weight Round plenum 

Size DN 300/400 500 600 800 Size DN 300/400 500 600 800 

Cote A 400 502 603 800 

Cote B 76 82 68 66 

Cote C 251 312 347 411 

Cote ØD 150 200 250 300 

Cote E 12 12 12 12 

Cote F 387 488 584 790 

Poids [Kg] 5.2 7.1 11.5 14.6 

A eff [m 2 ] 0.0080/0.0134 0.0214 0.0347 0.0508 

Size ØA 400 500 600 800 

Size B 76 82 67 66 

Size C 252 312 347 411 

Size ØD 150 200 250 300 

Size E 8 8 8 8 

Size Ø F 392 492 592 792 

Weight [Kg] 4.2 6.2 8.5 14.1 

A eff [m 2 ] 0.0080/0.0134 0.0214 0.0347 0.0508 

with square plenum - lateral input 

Suspension hole, 4 x Ø6.3 

with round plenum - lateral input 

Suspension bracket (3) 

Flow control 

(optional) 

ØD 

Flow control 

(optional) 

Perfored metal sheet 

Perfored 

metal sheet 

B 

E 

C 

14 

F 

A 

Ø F 

Ø A 

with square plenum - top input 

ØD 

with round plenum - top input 

Flow control 

(optional) 

Flow control 

(optional) 

Perfored 

metal sheet 

C 

Perfored 

metal sheet 

E 

ØD 

C 

B 

E 

8 

ØD 

C 

E 

F 

A 

8 

Ø F 

Ø A 





Correction factor of air flow 

for a reading with balometer 

To ensure adequate balancing of DAL 358 

type diffusers, it is recommended 

to use the correction factors of the 

airflow rate equivalent to the resistance 

generated by the balometer. 

These factors are valid for a ventilation 

system comprising at least 3 diffusers 

after a VAV unit or box. For less than 3 

diffusers with an automatic airflow rate 

setting, factors are lower than the stated 

ones. 

Such as indicated in the ALNOR manual, 

Appendix B - "Capture Hood Flow 

Resistance", the instrument's manufacturer 

recommends taking a reading at the 

ventilation duct and comparing it with 

one taken under the diffuser, with or 

without the balometer, in order to 

determine the correction factor. 

In order to avoid this procedure, we 

provide herein the correction factors 

needed for all DAL 358 diffuser models. 



100 50 

120 140 160 180 200 220 240 260 280 300 320 100 140 180 220 260 300 340 

120 160 200 240 280 320 360 

Adjustment: Helical - adjustment 21 

90 

80 

70 


160 

150 

140 

130 

60 

120 

50 

110 

40 

30 

20 

10 

100 

90 

80 

70 

10 20 30 40 50 60 70 80 90 80 90 100 110 120 130 140 150 

Air flow - Balometer (cfm) 


Balometer (cfm) 20 29 57 70 74 Balometer (cfm) 80 98 115 132 140 

Factor 1.00 1.01 1.05 1.06 1.07 

Factor 1.00 1.02 1.04 1.06 1.07 

Actual flow (cfm) 20 30 60 75 80 Actual flow (cfm) 80 100 120 140 150 



400 

350 

300 

250 

200 

150 



450 

400 

350 

300 

250 

200 

150 

100 



Balometer (cfm) 147 192 230 250 300 Balometer (cfm) 94 185 270 310 330 

Factor 1.02 1.04 1.08 1.12 1.13 

Factor 1.06 1.08 1.11 1.16 1.21 

Actual flow (cfm) 150 200 250 280 340 Actual flow (cfm) 100 200 300 350 400 

Actual flow at diffuser (cfm) 




650 

600 

550 

500 

450 

400 

350 

300 

250 

250 275 300 325 350 375 400 425 450 475 500 


Balometer (cfm) 360 392 415 446 480 

Factor 1.11 1.14 1.20 1.23 1.25 

Actual flow (cfm) 400 450 500 550 600 




Identification Chart 

Y 

X 

DN 

300 

400 

500 

600 

800 

X (mm) 

603 

603 

603 

603 

803 

Y(mm) 

355 

355 

455 

552 

755 




1 - Description and Physical Characteristics 

steel. Integrated slots in the frontal plate (circular or 

square) hold eccentric cylinders ensuring a high induc- 

1.2 The eccentric cylinders, 100 mm in length, are individually 

adjustable by rotating as much as 360°, each one 

on its own axis, inside the front plate. This design allows 

for a multitude of adjustments covering the range of air 

° 

360°). 

3 - Connection 

manufacturer. The plenum is made of 24-gauge galvanized 

steel and comprises a perforated stabilizing 

suspension points in accordance with paraseismic 

standards are provided. The input brace is centered on 

the side or on the top of the plenum, and its size is made 

The joints of the plenum are sealed with silicone caulking 

free of VOC emissions. 

ceiling or classic gypsum ceilings. 

(DAL 358 R and DAL 358 Q) 

1.4 Every plate is coated inside and outside with a baked 

polyester TGIC-enamel paint, providing a smooth, 

colour from the RAL colour chart or among special-order 

colours. 

1.5 Eccentric cylinders are available in black or white. 

4 - Balancing 

4.1 Balancing of the DAL 358 diffusers must be executed by 

a technician trained in ventilation system balancing with 

a professional certificate. 

4.2 The technician must take into consideration the correction 

factor for use of a balometer when regulating air 

volume. 

5 - Quality required: NAD Klima, model DAL 358 

2 -Performance 

even in situations requiring variable air volume -- in order 

the room (∆TXY = TR - TXY) and the initial temperature 

variation (∆TO = TR - TO). This ratio must perform a 

minimum of ∆TXY ÷ ∆TO ≤ 0.1. 

- 

tion software. This software indicates the pressure drop 

and sound power generated as well as a cross-sectional 

isothermal and heating modes. Upon demand from the 

engineer, the software can demonstrate a nominal 

velocity in an occupied zone of 0.25 m/s and can adapt to 

various requirements of air volume (25% to 100% of 

mode. 




DAL 358 

Product 

Q = Square 

R = Round 

300, 400, 500, 600, 800 

400, 502, 603, 800 

Nominal size 

(603 for 24''X24'' T-bar) Outer size 

HL = Flow high-rise (>5m) (exterior 21 and center CD) 

VF = 

1W = Flow on one side (2 1) 

2W = Flow on two opposite sides (2 1 - 5 6) 

2L = Flow on both side by L (2 corridors) (2 1) 

3C = Flow 90° (corner) (2 1) 

3W = Flow 180° (wall) (2 1 - 3 4) 

W = White roll and receptacle (RAL 9003) 

C = Cream roll and receptacle (RAL 9010) 

B = Black roll and receptacle 

X = Without roll 

9003 = White 

9010 = Cream 

_____ = RAL colour * (write the number of RAL colour) 

S = Plenum with lateral input 

T = Plenum with top input 

X = Without plenum 

X = Without insulation 

I = With acoustic insulation 

F = 

et 

X = Without damper 

D = With damper (for gypsum ceiling) 

Color of roll 

and receptacle 

Colour ( front plate) 

Plenum 

Insulation 

Damper 

DAL358 - Q - 300 - 400 - ST - W - 9003 - S - X - X 

Example 

Notes : 

Blue : Standard, in stock 

Write the number of 4 digits of the RAL color chart 

Our powder paint colors are available in the RAL color chart only. 



Concordia University, Montréal, Canada

www.nadklima.com 

NAD Klima 144, Léger Street, Sherbrooke (Québec), Canada J1L 1L9 • T : 819 780-0111 • 1 866 531-1739 • F : 819 780-1660 • info@nadklima.com

DAL 358 - NAD Klima

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