Specification Sheet

458
PERFORMANCE/DIMENSIONS
Gravity Relief 1:1 Ratio
Dimensional Data Throat Velocity in FPM @ Static Pressure - Relief
Throat
Area
Throat Size Hood Size
536 758 848 1073 1200
CFM @ Static Pressure - Relief
A x B C D E
.050 .100 .125 .200 .250
1.00 12 x 12 18 18 7 536 758 848 1073 1200
1.50 12 x18 19 25 7 804 1137 1272 1610 1800
2.00 12 x 24 20 32 7 1072 1516 1696 2146 2400
2.50 12 x 30 20 38 7 1340 1895 2120 2683 3000
3.00 12 x 36 21 45 7 1608 2274 2544 3219 3600
3.50 12 x42 22 52 7 1876 2653 2968 3756 4200
4.00 12 x48 23 57 7 2144 3032 3392 4292 4800
1.36 14 x 14 20 20 7 730 1032 1154 1460 1633
1.75 14 x18 22 22 7 938 1327 1484 1878 2100
2.33 14 x 24 23 33 7 1251 1769 1979 2504 2800
2.92 14 x 30 23 39 7 1563 2211 2473 3130 3500
3.50 14 x 36 23
45 7 1876 2653 2968 3756 4200
4.08 14 x 42 24 52 7 2189 3095 3463 4381 4900
4.67 14 x 48 24 58 7 2501 3537 3957 5007 5600
5.25 14 x 54 24 64 7 2814 3980 4452 5633 6300
1.78 16 x 16 23 23 7 953 1348 1508 1908 2133
2.22 16 x20 24 28 7 1191 1684 1884 2384 2667
2.67 16 x 24 25 33 7 1429 2021 2261 2861 3200
3.33 16 x 30 26 40 7 1787 2527 2827 3577 4000
4.00 16 x 36 26 46 7 2144 3032 3392 4292 4800
4.67 16 x 42 26 52 7 2501 3537 3957 5007 5600
5.33 16 x 48 27 59 7 2859 4043 4523 5723 6400
6.00 16 x 54 27 65 7 3216 4548 5088 6438 7200
6.67 16 x 60 27 71 7 3573 5053 5653 7153 8000
7.33 16 x 66 28 78 7 3931 5559
6219 7869 8800
2.25 18 x 18 26 26 8 1206 1706 1908 2414 2700
3.00 18 x 24 27 33 8 1608 2274 2544 3219 3600
3.75 18 x 30 28 40 8 2010 2843 3180 4024 4500
4.50 18 x 36 29 47 8 2412 3411 3816 4829 5400
5.25 18 x 42 29 53 8 2814 3980 4452 5633 6300
6.00 18 x 48 30 60 8 3216 4548 5088 6438 7200
6.75 18 x 54 30 66 8 3618 5117 5724 7243 8100
7.50 18 x 60 30 72 8 4020 5685 6360 8048 9000
8.25 18 x 66 31 79 8 4422 6254 6996 8852 9900
9.00 18 x 72 31 85 8 4824 6822 7632 9657 10800
2.78 20 x 20 29 29 9 1489 2106 2356 2981 3333
3.33 20 x24 31 33 9 1787 2527 2827 3577 4000
4.17 20 x 30 31 41 9 2233 3158 3533 4471 5000
5.00
20 x 36 31 47 9 2680 3790 4240 5365 6000
5.83 20 x 42 32 52 9 3127 4422 4947 6259 7000
6.67 20 x 48 33 61 9 3573 5053 5653 7153 8000
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