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26 VAV-PRC003-EN
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Procedures
Notes:
1. Recommended velocity for zone dampers is between 1000 and 1600 fpm. Use
good standard design practices (such as location of duct).
2. Recommended velocity for bypass damper is between 1600 and 2000 fpm.
Table 2. Damper sizing charts
Round Zone Damper
Capacity (cfm), Dimensions, and Weights
Size 6" 8" 10" 12" 14" 16"
600 120 210 330 470 640 840
800 160 280 435 630 855 1115
1000 200 350 545 785 1070 1395
1200 235 420 655 940 1280 1675
1400 275 490 765 1100 1500 1955
1600 315 560 875 1255 1710 2235
Length 12" 12" 16" 16" 20" 20"
Ship Wt 11 lbs 12 lbs 17 lbs 18 lbs 27 lbs 31 lbs
Recommended
Velocity (fpm)
Size 8 x 12 8 x 14 8 x 16 10 x 16 10 x 20 14 x 18
600 398 464 531 663 829 1045
800 531 619 707 884 1105 1393
1000 663 774 884 1105 1382 1741
1200 796 928 1061 1326 1658 2089
1400 928 1083 1238 1547 1934 2437
1600 1061 1238 1415 1769 2211 2785
Blades 2 2 2 3 3 4
Ship Wt 8 lbs 10 lbs 12 lbs 14 lbs 16 lbs 18 lbs
Velocity (fpm)
Rectangular Zone Damper
Capacity (cfm), Dimensions, Blades, and Weights
Recommended
Size 14 x 12 16 x 16 20 x 20 30 x 20
600 696 1061 1658 2487
800 928 1415 2211 3316
1000 1161 1769 2763 4145
1200 1393 2122 3316 4974
1400 1625 2476 3869 5803
1600 1857 2830 4421 6632
1800 2089 3183 4974 7461
2000 2321 3537 5527 8290
Blades 2333
Ship Wt 16 lbs 21 lbs 29 lbs 40 lbs
Recommended
Rectangular Bypass Damper
Capacity (cfm), Dimensions, Blades, and Weights
Velocity (fpm)
Size 6" 8" 10" 12"
600 120 210 330 470
800 160 280 435 630
1000 200 350 545 785
1200 235 420 655 940
1400 275 490 765 1100
1600 315 560 875 1255
1800 350 630 980 1415
2000 390 700 1090 1570
Length 12" 12" 16" 16"
Ship Wt 11 lbs 12 lbs 17 lbs 18 lbs
Recommended
Round Bypass Damper
Capacity (cfm), Dimensions, Blades, and Weights
Velocity (fpm)