Roof Downblast - Exhaust Belt Drive
GB-540
83
(2108)
*503⁄4 | (Pa) |
(1289) | Pressure |
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141⁄2 (368) | Static |
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13⁄4 (44) |
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64
(1626)
Damper Size = 54 x 54 (1371 x 1371) Roof Opening = 561/2 x 561/2 (1435 x 1435) Shroud Thickness = 0.100 (2.5)
Motor Cover Thickness = 0.064 (1.6) Curb Cap Thickness = 0.100 (2.5) ^Approximate Unit Weight = 748 lbs. (339 kg)
All dimensions in inches (millimeters).. *May be greater depending on motor. ^Weight shown is largest cataloged Open
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| RPM (Belt) |
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| HP |
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| Density 0.075 lb/ft3 |
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| Density 1.2 kg/m3 |
(in.wg) |
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| R | V | E |
Pressure |
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Volume (cfm x 1000)
Volume (m3/hr x 1000)
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..75 | 1 | 1..25 | 1..5 |
| 1..75 |
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540 |
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| CFM | 15488 | 1250 |
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| 175 | BHP | 0..61 | 0..65 |
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| MAXIMUM BHP AT A GIVEN RPM = (RPM/202)3 |
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| Sones | 6..9 | 6..3 |
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| MAXIMUM RPM = 505 |
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| CFM | 17258 | 14674 | 11068 |
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| TIP SPEED (ft/min) = RPM x 14.137 |
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1 | 195 | BHP | 0..85 | 0..90 | 0..87 |
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| MAXIMUM MOTOR FRAME SIZE = 256T |
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| Sones | 7..8 | 7..5 | 7..2 |
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| CFM | 18143 | 15724 | 12632 |
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| 205 | BHP | 0..99 | 1..04 | 1..03 |
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| Sones | 8..3 | 8..2 | 8..1 |
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| CFM | 20798 | 18814 | 16229 | 12673 |
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11⁄2 | 235 | BHP | 1..49 | 1..57 | 1..56 | 1..50 |
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| Sones | 10..1 | 10..4 | 10..5 | 10..6 |
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| CFM | 22922 | 21228 | 18963 | 16439 |
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2 | 259 | BHP | 1..99 | 2..09 | 2..11 | 2..08 |
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| Sones | 12..3 | 12..1 | 11..9 | 11..6 |
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| CFM | 26197 | 24874 | 22870 | 20831 | 18610 |
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3 | 296 | BHP | 2..97 | 3..11 | 3..14 | 3..13 | 3..10 |
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| Sones | 16..2 | 15..6 | 15..3 | 15..0 | 14..3 |
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| CFM | 31064 | 30005 | 28492 | 26810 | 25115 | 21376 |
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5 | 351 | BHP | 4..96 | 5..13 | 5..21 | 5..24 | 5..23 | 5..15 |
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| Sones | 21 | 21 | 19..9 | 19..3 | 18..7 | 17..4 |
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| CFM | 35578 | 34653 | 33552 | 32075 | 30612 | 27519 |
| 24274 |
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71⁄2 | 402 | BHP | 7..45 | 7..65 | 7..80 | 7..84 | 7..87 | 7..82 |
| 7..73 |
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| Sones | 27 | 26 | 26 | 25 | 24 | 23 |
| 21 |
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| CFM | 39118 | 38277 | 37435 | 36109 | 34766 | 32131 |
| 29134 | 26111 |
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10 | 442 | BHP | 9..90 | 10..12 | 10..34 | 10..39 | 10..44 | 10..46 |
| 10..36 | 10..24 |
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| Sones | 32 | 32 | 32 | 32 | 32 | 28 |
| 27 | 26 |
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| CFM | 41950 | 41165 | 40381 | 39287 | 38034 | 35558 |
| 32927 | 30151 | 26271 |
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| 474 | BHP | 12..21 | 12..45 | 12..68 | 12..80 | 12..85 | 12..90 |
| 12..84 | 12..73 | 12..42 |
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15 |
| Sones | 36 | 36 | 37 | 36 | 35 | 33 |
| 31 | 30 | 28 |
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| CFM | 44694 | 43957 | 43221 | 42332 | 41157 | 38813 |
| 36503 | 33869 | 31293 |
| 26758 |
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| 505 | BHP | 14..77 | 15..02 | 15..27 | 15..45 | 15..51 | 15..60 |
| 15..60 | 15..48 | 15..36 |
| 14..84 |
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| Sones | 40 | 40 | 40 | 40 | 39 | 38 |
| 36 | 35 | 32 |
| 30 |
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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.
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