Engineering Bulletin
Table Of Contents
821, 831, 92 Series and 98VOH (Page 6-8, 11)
Deflection E
400 500 600 700 800 900 1000 1100 1200 1300 1400 1600 1800 2000
.010 .016 .022 .031 .040 .050 .062 .075 .090 .105 .122 .160 .202 .249
CFM 50 60 75 85 100 110 125 135 150 160 175 200 225 250
Throw 3.5 4.5 5.5 6.0 7.5 8.0 9.0 10.0 11.0 12.0 13.0 15.0 16.0 18.0
CFM 65 80 95 110 125 140 155 175 190 205 220 250 285 315
Throw 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 16.0 19.0 20.0
CFM 75 95 115 135 150 170 190 210 230 245 265 305 340 380
Throw 4.5 5.5 7.0 8.0 9.0 10.0 11.0 12.0 14.0 15.0 16.0 18.0 20.0 22.0
CFM 90 110 135 155 180 200 220 245 265 290 310 355 400 445
Throw 5.0 6.0 7.5 8.5 10.0 11.0 12.0 13.0 14.0 16.0 17.0 19.0 22.0 24.0
CFM 95 120 145 170 195 220 240 265 290 315 340 385 435 485
Throw 5.0 6.5 7.5 9.0 10.0 12.0 13.0 14.0 15.0 17.0 18.0 20.0 23.0 25.0
CFM 100 120 145 170 195 220 245 270 295 315 340 390 440 490
Throw 5.0 6.5 7.5 9.0 10.0 11.0 13.0 14.0 15.0 16.0 18.0 20.0 23.0 26.0
CFM 115 140 170 200 225 255 285 310 340 370 400 455 510 570
Throw 5.5 7.0 8.0 9.5 11.0 12.0 14.0 15.0 16.0 18.0 19.0 22.0 25.0 28.0
CFM 120 145 175 205 235 265 295 325 355 380 410 470 530 590
Throw 5.5 7.0 8.5 9.5 11.0 13.0 14.0 15.0 17.0 18.0 19.0 22.0 25.0 28.0
CFM 130 165 195 230 260 295 325 360 390 425 455 520 585 650
Throw 6.0 7.5 9.0 10.0 12.0 13.0 15.0 16.0 18.0 19.0 21.0 24.0 26.0 29.0
CFM 140 175 205 240 275 310 345 380 415 450 485 550 620 690
Throw 6.0 7.5 9.0 11.0 12.0 14.0 15.0 17.0 18.0 20.0 21.0 24.0 27.0 30.0
CFM 16 200 240 275 315 355 395 435 475 515 555 635 715 790
Throw 6.5 8.0 10.0 11.0 13.0 15.0 16.0 18.0 19.0 21.0 23.0 26.0 29.0 32.0
CFM 165 205 245 285 325 365 410 450 490 530 570 655 735 815
Throw 6.5 8.5 10.0 11.0 13.0 15.0 17.0 18.0 20.0 21.0 23.0 26.0 30.0 33.0
CFM 195 245 295 345 395 445 490 540 590 640
690
785 885 965
Throw 7.0 9.0 11.0 13.0 14.0 16.0 18.0 20.0 22.0 23.0 25.0 29.0 32.0 36.0
CFM 200 250 300 350 400 445 495 545 595 645 695 795 895 995
Throw 7.5 9.0 11.0 13.0 15.0 16.0 18.0 20.0 22.0 24.0 25.0 29.0 33.0 36.0
CFM 240 300 360 420 480 540 600 660 720 775 835 955 1075 1195
Throw 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 28.0 32.0 36.0 40.0
CFM 270 335 405 470 540 605 675 740 810 875 940 1075 1210 1345
Throw 8.5 11.0 13.0 15.0 17.0 19.0 21.0 23.0 25.0 27.0 30.0 34.0 38.0 42.0
CFM 300 375 450 525 600 675 750 825 900 975 1050 1200 1350 1500
Throw 9.0 11.0 13.0 16.0 18.0 20.0 22.0 25.0 27.0 29.0 31.0 36.0 40.0 45.0
CFM 325 405 485 570 650 730 810 890 975 1055 1135 1300 1460 1620
Throw 9.5 12.0 14.0 16.0 19.0 21.0 23.0 25.0 28.0 30.0 32.0 37.0 42.0 46.0
CFM 405 510 610 710 815 915 1015 1120 1220 1320 1425 1625 1830 2035
Throw 11.0 13.0 16.0 18.0 21.0 23.0 26.0 29.0 31.0 34.0 36.0 42.0 47.0 52.0
CFM 410 510 615 715 820 920 1025 1125 1230 1330 1430 1635 1840 2045
Throw 10.0 13.0 16.0 18.0 21.0 23.0 26.0 29.0 31.0 34.0 36.0 42.0 47.0 52.0
CFM 490 610 735 855 980 1100 1220 1345 1465 1590 1710 1955 2200 2445
Throw 11.0 14.0 17.0 20.0 23.0 26.0 28.0 31.0 34.0 37.0 40.0 46.0 51.0 57.0
CFM 495 620 740 865 990 1110 1235 1360 1485 1605 1730 1975 2225 2470
Throw 11.0 14.0 17.0 20.0 23.0 26.0 29.0 32.0 34.0 37.0 40.0 46.0 52.0 57.0
CFM 515 640 770 900 1025 1155 1285 1410 1540 1670 1795 2055 2310 2565
Throw 12.0 15.0 17.0 20.0 23.0 26.0 29.0 32.0 35.0 38.0 42.0 46.0 52.0 58.0
CFM 615 770 925 1080 1235 1390 1545 1700 1850 2005 2160 2470 2775 3085
Throw 13.0 16.0 19.0 22.0 26.0 29.0 32.0 35.0 38.0 42.0 45.0 51.0 57.0 64.0
CFM 620 775 930 1085 1240 1395 1550 1705 1860 2015 2170 2480 2790 3100
Throw 13.0 16.0 19.0 22.0 26.0 29.0 32.0 35.0 39.0 42.0 45.0 51.0 58.0 64.0
CFM 745 930 1120 1305 1490 1680 1865 2050 2235 2425 2610 2980 3355 3730
Throw 14.0 18.0 21.0 25.0 28.0
32.0
35.0 39.0 42.0 46.0 49.0 56.0 63.0 70.0
Terminal Velocity of 75 FPM
Face Velocity
Pressure Loss
8 x 4
Ak .124
10 x 4
Ak .157
12 x 4
Ak .190
14 x 4
Ak .222
12 x 5
Ak .242
10 x 6
Ak .244
14 x 5
Ak .284
12 x 6
Ak .294
16 x 5
Ak .325
14 x 6
Ak .345
16 x 6
Ak .396
20 x 5
Ak .408
24 x 5
Ak .492
20 x 6
Ak .497
24 x 6
Ak .598
20 x 8
Ak .673
30 x 6
Ak .750
24 x 8
Ak .811
30 x 8
Ak 1.017
24 x 10
Ak 1.023
36 x 8
Ak 1.222
24 x 12
Ak 1.236
30 x 10
Ak 1.283
36 x 10
Ak 1.543
30 x 12
Ak 1.550
36 x 12
Ak 1.864
For sizes not listed and sizing tips see page 76
Deflection G
400 500 600 700 800 900 1000 1100 1200 1300 1400 1600 1800 2000
.010 .016 .022 .031 .040 .050 .062 .075 .090 .105 .122 .160 .202 .249
CFM 50 60 70 85 95 105 120 130 145 155 165 190 215 240
Throw 2.5 3.0 4.0 4.5 5.0 5.5 6.5 7.0 8.0 8.5 9.0 10.0 12.0 13.0
CFM 55 70 85 100 115 130 145 155 170 185 200 230 255 285
Throw 2.5 3.5 4.0 5.0 5.5 6.5 7.0 7.5 8.0 9.0 9.5 11.0 12.0 14.0
CFM 70 85 105 120 140 155 175 190 210 225 240 275 310 345
Throw 3.0 3.5 4.5 5.5 6.0 7.0 7.5 8.5 9.0 10.0 11.0 12.0 14.0 15.0
CFM 80 100 120 140 160 180 200 220 240 265 285 325 365 405
Throw 3.0 4.0 5.0 5.5 6.5 7.5 8.0 9.0 9.5 11.0 12.0 13.0 15.0 16.0
CFM 90 110 130 155 175 200 220 240 265 285 310 350 395 440
Throw 3.5 4.5 5.0 6.0 7.0 8.0 8.5 9.5 10.0 11.0 12.0 14.0 15.0 17.0
CFM 90 110 135 155 180 200 220 245 265 290 310 355 400 445
Throw 3.5 4.5 5.0 6.0 7.0 7.5 8.5 9.5 10.0 11.0 12.0 14.0 15.0 17.0
CFM 105 130 155 180 205 230 260 285 310 335 360 415 465 515
Throw 4.0 4.5 5.5 6.5 7.5 8.5 9.5 10.0 11.0 12.0 13.0 15.0 17.0 18.0
CFM 105 135 160 190 215 240 270 295 320 350 375 430 480 535
Throw 4.0 5.0 5.5 6.5 7.5 8.5 9.5 10.0 11.0 12.0 13.0 15.0 17.0 19.0
CFM 120 150 180 205 235 265 295 325 355 385 415 475 535 590
Throw 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 16.0 18.0 20.0
CFM 125 155 190 220 250 285 315 345 375 410 440 500 565 630
Throw 4.0 5.0 6.0 7.0 8.0 9.5 10.0 11.0 12.0 13.0 14.0 16.0 18.0 20.0
CFM 145 180 215 250 290 325 360 395 430 470 505 575 650 720
Throw 4.5 5.5 6.5 7.5 9.0 10.0 11.0 12.0 13.0 14.0 15.0 17.0 20.0 22.0
CFM 150 185 225 260 300 335 370 410 445 485 520 595 670 745
Throw 4.5 5.5 6.5 7.5 9.0 10.0 11.0 12.0 13.0 14.0 15.0 18.0 20.0 22.0
CFM 180 225 270 315 360 405 450 495 540 580
625
715 805 895
Throw 5.0 7.5 7.5 8.5 10.0 11.0 12.0 13.0 15.0 16.0 17.0 19.0 22.0 24.0
CFM 180 225 270 315 360 410 455 500 545 590 635 725 815 905
Throw 5.0 6.0 7.5 8.5 10.0 11.0 12.0 14.0 15.0 16.0 17.0 20.0 22.0 25.0
CFM 220 275 325 380 435 490 545 600 655 710 765 870 980 1090
Throw 5.5 7.0 8.0 9.5 11.0 12.0 13.0 15.0 16.0 18.0 19.0 21.0 24.0 27.0
CFM 245 305 370 430 490 555 615 675 735 800 860 980 1105 1230
Throw 5.5 7.0 8.5 10.0 11.0 13.0 14.0 16.0 17.0 19.0 20.0 23.0 26.0 29.0
CFM 275 340 410 480 545 615 685 750 820 890 955 1095 1230 1365
Throw 6.0 7.5 9.0 11.0 12.0 14.0 15.0 17.0 18.0 20.0 21.0 24.0 27.0 30.0
CFM 295 370 445 515 590 665 740 815 885 960 1035 1180 1330 1480
Throw 6.5 8.0 9.5 11.0 13.0 14.0 16.0 17.0 19.0 20.0 22.0 25.0 28.0 31.0
CFM 370 465 555 650 740 835 925 1020 1110 1205 1295 1480 1665 1850
Throw 7.0 9.0 10.0 12.0 14.0 16.0 17.0 19.0 21.0 23.0 24.0 28.0 31.0 35.0
CFM 375 465 560 650 745 840 930 1025 1120 1210 1305 1490 1675 1865
Throw 7.0 9.0 11.0 12.0 14.0 16.0 18.0 19.0 21.0 23.0 25.0 28.0 32.0 35.0
CFM 445 555 670 780 890 1005 1115 1225 1335 1450 1560 1780 2005 2230
Throw 7.5 9.5 12.0 13.0 15.0 17.0 19.0 21.0 23.0 25.0 27.0 31.0 35.0 39.0
CFM 450 565 675 790 900 1015 1125 1240 1350 1465 1575 1800 2025 2250
Throw 7.5 9.5 12.0 14.0 15.0 17.0 19.0 21.0 23.0 25.0 27.0 31.0 35.0 39.0
CFM 470 585 700 820 935 1050 1170 1285 1405 1520 1635 1870 2105 2340
Throw 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 27.0 31.0 35.0 39.0
CFM 560 705 845 985 1125 1265 1405 1545 1685 1830 1970 2250 2530 2810
Throw 8.5 11.0 13.0 15.0 17.0 19.0 22.0 24.0 26.0 28.0 30.0 35.0 39.0 43.0
CFM 565 705 845 990 1130 1270 1410 1555 1695 1835 1975 2260 2540 2825
Throw 8.5 11.0 13.0 15.0 17.0 19.0 22.0 24.0 26.0 28.0 30.0 35.0 39.0 43.0
CFM 680 850 1020 1190 1360 1530 1700 1870 2040 2210 2375 2715 3055 3395
Throw 9.5 12.0 14.0 17.0 19.0
21.0
24.0 26.0 29.0 31.0 33.0 38.0 43.0 48.0
Terminal Velocity of 75 FPM
Face Velocity
Pressure Loss
8 x 4
Ak .119
10 x 4
Ak .143
12 x 4
Ak .173
14 x 4
Ak .202
12 x 5
Ak .220
10 x 6
Ak .222
14 x 5
Ak .258
12 x 6
Ak .268
16 x 5
Ak .296
14 x 6
Ak .314
16 x 6
Ak .360
20 x 5
Ak .372
30 x 10
Ak 1.169
24 x 5
Ak .448
20 x 6
Ak .453
24 x 6
Ak .545
20 x 8
Ak .614
36 x 10
Ak 1.406
36 x 12
Ak 1.698
For sizes not listed and sizing tips see page 76
30 x 6
Ak .683
24 x 8
Ak .739
30 x 8
Ak .926
24 x 10
Ak .932
30 x 12
Ak 1.412
36 x 8
Ak 1.114
24 x 12
Ak 1.126
See Alternate Sizing Graph on Page 118.
*NC 30 NC 35 NC 40 **NC 45
* less than or equal to ** greater than or equal to
0
0
10'
10'
10'
20' 30' 40' 50' 60'
0
0
10'
10'
10'
20' 30' 40' 50'
0
0
10'
10'
10'
20' 30'
0
0
10'
10'
10'
20' 30'
55 42 22 0 22 42
0 2222
0 22
22
4242
55
0
0
10'
10'
10'
20' 30' 40' 50' 60'
0
0
10'
10'
10'
20' 30' 40' 50'
0
0
10'
10'
10'
20' 30'
0
0
10'
10'
10'
20' 30'
55 42 22 0 22 42
0 2222 0 22
224242
55
Recommended Noise Criteria and Face Velocity Ranges are on page 75
78
Engineering Data
Engineering Data