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ManualsBrandsHart & Cooley ManualsCommercial Registers & Grilles14" x 10" (Wall Opening Size) White Commercial Supply Register (821 Series)

C Series Curved-Blade

Diffusers

Selection Procedure

1. Determine the diffuser air pattern best

suited to the duct layout and room area to be

served.

2. Select the air pattern type and CFM per

outlet. The tables give the recommended

limits of air volume per outlet for various

ceiling heights. Choose the correct table for

the style diffuser selected. Outlets are

assumed to be mounted flush on the ceiling

and no obstruction to the air stream.

3. Turn to the proper SIZE SELECTION

TABLE for the air pattern desired.

4. Determine the appropriate size based on

the CFM, Throw, Pressure Loss, and Face

Velocity requirements.

Curved-Blade – C Series

Maximum CFM

per outlet

Ceiling

Height

In Feet

Maximum Cooling

Temperature

Differential (°F)

1 way

2 way

3 way

4 way

15°

150

225

300

18°

100

200

300

400

20°

200

400

600

800

22°

300

600

900

1200

25°

400

800

1200

1600

25°

500

1000

1500

2000

25°

700

1400

2100

2800

25°

900

1800

2700

3600

The Face Bars on the Curved-Blade Diffuser should be pre-set

to the dimension shown below.

13/32"

*NC 30 NC 35 **NC 40

* less than or equal to ** greater than or equal to

C Series Curved-Blade Diffusers

(Page 17-21)

One-Way, Two-Way

400 500 600 700 800 900 1000 1100 1200

.010 .016 .022 .031 .040 .050 .062 .075 .090

CFM 35 45 55 65 70 80 90 100 110

Throw 1/2 3.5/2.5 5.0/3.5 6.0/4.0 7.0/5.0 7.5/5.5 8.5/6.0 9.5/7.0 11.0/7.5 11.5/8.5

CFM 40 50 60 70 80 90 100 110 120

Throw 1/2 3.5/2.5 4.5/3.0 5.5/4.0 6.5/4.5 7.0/5.0 8.0/6.0 9.0/6.5 10.0/7.0 11.0/7.5

CFM 60 75 90 105 120 135 150 165 180

Throw 1/2 5.0/3.5 6.0/4.5 7.0/5.0 8.5/6.0 9.5/7.0 11.0/7.5 12.0/8.5 13.0/9.5 14.0/10.0

CFM 65 80 95 110 130 145 160 175 190

Throw 1/2 5.0/3.5 6.0/4.5 7.5/5.0 8.5/6.0 10.0/7.0 11.0/8.0 12.0/9.0 14.0/9.5 15.0/10.0

CFM 70 90 110 125 145 160 180 200 215

Throw 1/2 5.0/3.5 6.5/4.5 8.0/5.5 9.0/6.5 11.0/7.5 12.0/8.5 13.0/9.5 15.0/10.0 16.0/11.0

CFM 85 105 125 145 170 190 210 230 250

Throw 1/2 5.5/4.0 7.0/5.0 8.5/6.0 10.0/7.0 11.0/8.0 13.0/9.0 14.0/10.0 16.0/11.0 17.0/12.0

CFM 95 120 145 170 190 215 240 265 290

Throw 1/2 6.0/4.0 7.5/5.0 9.0/6.5 10.0/7.5 12.0/8.0 13.0/9.5 15.0/10.0 16.0/11.0 18.0/13.0

CFM 115 145 175 205 230 260 290 320 350

Throw 1/2 6.5/4.5 8.0/5.5 9.5/7.0 11.0/8.0 13.0/9.0 14.0/10.0 16.0/11.0 18.0/13.0 19.0/14.0

CFM 125 155 185 215 250 280 310 340 370

Throw 1/2 6.5/5.0 8.5/6.0 10.0/7.0 12.0/8.0 13.0/9.5 15.0/11.0 17.0/12.0 18.0/13.0 20.0/14.0

CFM 140 175 210 245 280 315 350 385 420

Throw 1/2 7.0/5.0 9.0/6.0 11.0/7.5 12.0/8.5 14.0/10.0 16.0/11.0 18.0/12.0 19.0/14.0 21.0/15.0

CFM 185 230 275 320 370 415 460 505 550

Throw 1/2 8.0/5.5 10.0/7.5 12.0/9.0 14.0/10.0 16.0/11.0 18.0/13.0 20.0/14.0 22.0/16.0 24.0/17.0

CFM 190 240 290 335 385 430 480 530 575

Throw 1/2 8.0/5.5 10.0/7.5 12.0/9.0 14.0/10.0 17.0/12.0 18.0/13.0 21.0/15.0 23.0/16.0 25.0/17.0

CFM 250 315 380 440 505 565 630 695 755

Throw 1/2 9.5/6.5 12.0/8.5 14.0/10.0 16.0/12.0 19.0/13.0 21.0/15.0 23.0/17.0 26.0/18.0 28.0/20.0

CFM 270 340 410 475 545 610 680 750 815

Throw 1/2 9.5/7.0 12.0/8.5 15.0/10.0 17.0/12.0 19.0/14.0 22.0/15.0 24.0/17.0 27.0/19.0 29.0/21.0

CFM 280 350 420 490 560 630 700 770 840

Throw 1/2 10.0/7.0 12.0/8.5 15.0/10.0 17.0/12.0 20.0/14.0 22.0/16.0 25.0/17.0 27.0/19.0 30.0/21.0

CFM 290 365 440 510 585 655 730 805 875

Throw 1/2 10.0/7.0 13.0.9.0 15.0/11.0 18.0/12.0 20.0/14.0 23.0/16.0 25.0/18.0 28.0/20.0 30.0/21.0

CFM 350 440 530 615 705 790 880 970 1055

Throw 1/2 11.0/8.0 14.0/10.0 17.0/12.0 19.0/14.0 22.0/16.0 25.0/18.0 28.0/20.0 31.0/22.0 33.0/24.0

CFM 420 525 630 735 840 945 1050 1155 1260

Throw 1/2 12.0/8.5 15.0/11.0 18.0/13.0 21.0/15.0 24.0/17.0 27.0/19.0 30.0/21.0 33.0/23.0 36.0/25.0

CFM 460 575 690 805 920 1035 1150 1265 1380

Throw 1/2 12.0/9.0 16.0/11.0 19.0/13.0 22.0/15.0 25.0/18.0 28.0/20.0 31.0/22.0 34.0/24.0 37.0/26.0

CFM 560

700 840 980 1120 1260 1400 1540 1680

Throw 1/2 14.0/9.5 17.0/12.0 21.0/15.0 24.0/17.0 27.0/19.0 31.0/22.0 34.0/24.0 38.0/27.0 41.0/29.0

Terminal Velocity of 75 FPM

Face Velocity

Pressure Loss

6 x 6

Ak .090

8 x 6

Ak .100

10 x 6

Ak .150

8 x 8

Ak .160

12 x 6

Ak .180

14 x 6

Ak .210

36 x 10

Ak .880

10 x 10

Ak .240

12 x 10

Ak .290

16 x 8

Ak .310

12 x 12

Ak .350

36 x 12

Ak 1.050

36 x 16

Ak 1.400

For sizes not listed and sizing tips see page(s) 76

16 x 12

Ak .460

14 x 14

Ak .480

16 x 16

Ak .630

20 x 14

Ak .680

30 x 16

Ak 1.150

24 x 12

Ak. 700

30 x 10

Ak .730

Recommended Noise Criteria and Face Velocity Ranges are on page 75

Engineering Data