Roof Downblast - Exhaust Belt Drive
GB-480
733⁄4
(1873)
*471⁄4
(1200)
111⁄4 (286)
13⁄4 (44)
58
(1473)
Damper Size = 48 x 48 (1219 x 1219) Roof Opening = 501/2 x 501/2 (1283 x 1283) Shroud Thickness = 0.080 (2.0)
Motor Cover Thickness = 0.064 (1.6) Curb Cap Thickness = 0.100 (2.5) ^Approximate Unit Weight = 623 lbs. (283 kg)
Static Pressure (Pa)
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| RPM (Belt) |
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| Density 0.075 lb/ft3 |
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| Density 1.2 kg/m3 |
wg) |
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(in. |
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| U | R | V |
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Pressure |
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Static |
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| F | T |
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Volume (cfm x 1000)
Volume (m3/hr x 1000)
All dimensions in inches (millimeters).. *May be greater depending on motor. ^Weight shown is largest cataloged Open
Motor | Fan |
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| Static Pressure in Inches wg |
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HP | RPM |
| 0 | 0..125 | 0..25 | 0..375 | 0..5 | 0..625 | 0..75 | 0..875 | 1 |
| 1..25 |
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480 |
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| CFM | 12020 | 10059 | 6529 |
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1/2 | 200 | BHP | 0..51 | 0..55 | 0..48 |
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| MAXIMUM BHP AT A GIVEN RPM = (RPM/245)3 |
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| Sones | 7..3 | 6..6 | 7..3 |
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| MAXIMUM RPM = 485 |
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| CFM | 13522 | 11811 | 9500 |
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| TIP SPEED (ft/min) = RPM x 12.632 |
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3/4 | 225 | BHP | 0..73 | 0..77 | 0..76 |
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| MAXIMUM MOTOR FRAME SIZE = 215T |
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| Sones | 8..3 | 8..0 | 7..6 |
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| CFM | 15025 | 13516 | 11662 | 8820 |
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1 | 250 | BHP | 1..00 | 1..05 | 1..06 | 0..98 |
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| Sones | 9..5 | 9..5 | 8..6 | 8..1 |
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| CFM | 17129 | 15830 | 14379 | 12517 | 9587 |
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11⁄2 | 285 | BHP | 1..48 | 1..54 | 1..58 | 1..56 | 1..42 |
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| Sones | 11..8 | 11..2 | 10..7 | 10..0 | 9..1 |
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| CFM | 18631 | 17437 | 16135 | 14589 | 12656 |
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2 | 310 | BHP | 1..90 | 1..97 | 2..02 | 2..02 | 1..97 |
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| Sones | 14..0 | 13..0 | 12..2 | 12..0 | 11..5 |
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| CFM | 21636 | 20608 | 19548 | 18385 | 17010 | 15420 |
| 13507 |
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3 | 360 | BHP | 2..98 | 3..06 | 3..13 | 3..17 | 3..17 | 3..21 |
| 3..00 |
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| Sones | 17..6 | 17..0 | 16..4 | 15..9 | 15..5 | 15..0 |
| 14..2 |
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| CFM | 23619 | 22678 | 21736 | 20683 | 19605 | 18254 |
| 16764 | 15086 |
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| 393 | BHP | 3..87 | 3..66 | 4..05 | 4..10 | 4..14 | 4..12 |
| 4..06 | 3..94 |
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| Sones | 20 | 19..9 | 19..5 | 18..8 | 18..3 | 18..0 |
| 17..5 | 16..7 |
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| CFM | 24942 | 24050 | 23158 | 22189 | 21181 | 20012 |
| 18733 | 17211 | 15486 |
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5 | 415 | BHP | 4..56 | 4..65 | 4..75 | 4..81 | 4..85 | 4..86 |
| 4..84 | 4..74 | 4..58 |
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| Sones | 22 | 22 | 22 | 21 | 21 | 20 |
| 20 | 19..1 | 18..1 |
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| CFM | 25542 | 24672 | 23801 | 22868 | 21883 | 20799 |
| 19550 | 18156 | 16604 |
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| 425 | BHP | 4..90 | 4..99 | 5..09 | 5..16 | 5..20 | 5..22 |
| 5..20 | 5..13 | 5..00 |
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| Sones | 23 | 23 | 23 | 22 | 22 | 21 |
| 21 | 20 | 19..3 |
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| CFM | 27345 | 26532 | 25719 | 24886 | 23966 | 23046 |
| 21953 | 20786 | 19471 |
| 15870 |
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| 455 | BHP | 6..01 | 6..11 | 6..22 | 6..31 | 6..36 | 6..41 |
| 6..41 | 6..38 | 6..30 |
| 5..85 |
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71⁄2 |
| Sones | 27 | 27 | 27 | 26 | 26 | 25 |
| 25 | 24 | 24 |
| 21 |
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| CFM | 29149 | 28386 | 27623 | 26860 | 26016 | 25153 |
| 24290 | 23201 | 22106 |
| 19517 |
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| 485 | BHP | 7..28 | 7..39 | 7..50 | 7..61 | 7..67 | 7..72 |
| 7..78 | 7..75 | 7..73 |
| 7..49 |
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| Sones | 31 | 31 | 31 | 31 | 30 | 29 |
| 29 | 28 | 28 |
| 26 |
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Performance certified is for installation type A: Free inlet, Free outlet. Power rating (BHP) does not include transmission losses. Performance ratings include the effects of a birdscreen. The sound ratings shown are loudness values in hemispherical sones at 5 ft. (1.5 m) in a hemispherical free field calculated per AMCA Standard 301. Values shown are for installation type A: free inlet hemispherical sone levels.
44
