Specification Sheet

461
Gravity Intake 2:1 Ratio
Dimensional Data Throat Velocity in FPM @ Static Pressure - Intake
Throat
Area
Throat Size Hood Size
312/625 441/883 592/998 592/1185 625/1250
CFM @ Static Pressure - Intake
A x B C D E
.050 .100 .125 .180 .200
1.00 12 x 12 21 21 7 625 883 988 1185 1250
1.50 12 x 18 23 29 7 938 1325 1482 1778 1875
2.00 12 x 24 25 37 7 1250 1766 1976 2370 2500
2.50 12 x 30 26 44 7 1563 2208 2470 2963 3125
3.00 12 x 36 27 51 7 1875 2649 2964 3555 3750
3.50 12 x 42 29 57 7 2188 3091 3458 4148 4375
4.00 12 x 48 28 64 7 2500 3532 3952 4740 5000
1.36 14 x 14 25 25 8 851 1202 1345 1613 1701
1.75 14 x 18 26 30 8 1094 1545 1729 2074 2188
2.33 14 x 24 28 38 8 1458 2060 2305 2765 2917
2.92 14 x 30 29 45 8 1823 2575 2882 3456 3646
3.50 14 x 36 30
52 8 2188 3091 3458 4148 4375
4.08 14 x 42 30 57 8 2552 3606 4034 4839 5104
4.67 14 x 48 31 65 8 2917 4121 4611 5530 5833
5.25 14 x 54 32 72 8 3281 4636 5187 6221 6563
1.78 16 x 16 28 28 9 1111 1570 1756 2107 2222
2.22 16 x 20 29 33 9 1389 1962 2196 2633 2778
2.67 16 x 24 31 39 9 1667 2355 2635 3160 3333
3.33 16 x 30 32 45 9 2083 2943 3293 3950 4167
4.00 16 x 36 33 53 9 2500 3532 3952 4740 5000
4.67 16 x 42 33 59 9 2917 4121 4611 5530 5833
5.33 16 x 48 35 67 9 3333 4709 5269 6320 6667
6.00 16 x 54 36 74 9 3750 5298 5928 7110 7500
6.67 16 x 60 36 80 9 4167 5887 6587 7900 8333
7.33 16 x 66 37 87 9 4583 6475
7245 8690 9167
2.25 18 x 18 32 32 10 1406 1987 2223 2666 2813
3.00 18 x 24 33 40 10 1875 2649 2964 3555 3750
3.75 18 x 30 36 48 10 2344 3311 3705 4444 4688
4.50 18 x 36 37 55 10 2813 3974 4446 5333 5625
5.25 18 x 42 38 62 10 3281 4636 5187 6221 6563
6.00 18 x 48 39 69 10 3750 5298 5928 7110 7500
6.75 18 x 54 40 76 10 4219 5960 6669 7999 8438
7.50 18 x 60 40 82 10 4688 6623 7410 8888 9375
8.25 18 x 66 41 89 10 5156 7285 8151 9776 10313
9.00 18 x 72 41 95 10 5625 7947 8892 10665 11250
2.78 20 x 20 35 35 11 1736 2453 2744 3292 3472
3.33 20 x 24 37 41 11 2083 2943 3293 3950 4167
4.17 20 x 30 38 48 11 2604 3679 4117 4938 5208
5.00
20 x 36 40 56 11 3125 4415 4940 5925 6250
5.83 20 x 42 40 60 11 3646 5151 5763 6913 7292
6.67 20 x 48 42 70 11 4167 5887 6587 7900 8333
Hoods wider than 98" will ship knocked down.
Insect Screens - Add .10 to area shown in table. Damper - Add .10 to area shown in table. Filters - Add .17 to area shown in table.
MODEL BGH
FABRICATED GRAVITY RELIEF/INTAKE VENTILATORS