Roof Downblast - Exhaust Belt Drive
GB-260
50
(1270)
*36 | (Pa) |
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(914) | Pressure |
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81⁄4 (210) | Static |
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13⁄4 (44) |
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40
(1016)
Damper Size = 30 x 30 (762 x 762) Roof Opening = 321/2 x 321/2 (826 x 826) Shroud Thickness = 0.064 (1.6) Motor Cover Thickness = 0.051 (1.3) Curb Cap Thickness = 0.064 (1.6) ^Approximate Unit Weight = 305 lbs. (138 kg)
All dimensions in inches (millimeters).. *May be greater depending on motor. ^Weight shown is largest cataloged Open
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| Density | 0.075 lb/ft3 |
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| Density 1.2 kg/m3 | |
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wg) |
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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..5 | 0..75 | 1 | 1..25 | 1..5 | 1..75 |
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260 |
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| CFM | 3875 | 3121 | 1727 |
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| 300 | BHP | 0..12 | 0..14 | 0..12 |
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| MAXIMUM BHP AT A GIVEN RPM = (RPM/572)3 |
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| Sones | 8..0 | 7..1 | 7..4 |
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1/4 |
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| MAXIMUM RPM = 835 |
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365 | CFM | 4714 | 4130 | 3393 |
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| TIP SPEED (ft/min) = RPM x 7.985 |
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| BHP | 0..22 | 0..25 | 0..26 |
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| MAXIMUM MOTOR FRAME SIZE = 184T |
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| Sones | 9..2 | 8..8 | 8..6 |
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| CFM | 5231 | 4716 | 4095 |
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1/3 | 405 | BHP | 0..30 | 0..33 | 0..35 |
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| Sones | 10..4 | 10..3 | 10..3 |
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| CFM | 6005 | 5570 | 5063 | 3745 |
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1/2 | 465 | BHP | 0..45 | 0..50 | 0..52 | 0..53 |
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| Sones | 11..4 | 10..9 | 10..4 | 9..6 |
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| CFM | 6716 | 6324 | 5898 | 4869 | 3008 |
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3/4 | 520 | BHP | 0..63 | 0..68 | 0..72 | 0..75 | 0..64 |
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| Sones | 12..9 | 12..1 | 11..3 | 10..3 | 9..4 |
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| CFM | 7491 | 7137 | 6775 | 5912 | 4826 |
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1 | 580 | BHP | 0..88 | 0..93 | 0..98 | 1..04 | 1..03 |
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| Sones | 14..4 | 13..7 | 13..0 | 12..2 | 11..0 |
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| CFM | 8588 | 8278 | 7979 | 7274 | 6474 | 5465 |
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11⁄2 | 665 | BHP | 1..33 | 1..39 | 1..44 | 1..53 | 1..57 | 1..55 |
| 1..29 |
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| Sones | 16..7 | 16..2 | 15..8 | 15..0 | 14..2 | 13..3 |
| 12..8 |
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| CFM | 9041 | 8746 | 8460 | 7811 | 7068 | 6227 |
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| 700 | BHP | 1..55 | 1..61 | 1..67 | 1..77 | 1..82 | 1..83 |
| 1..71 |
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| Sones | 17..8 | 17..4 | 17..0 | 16..2 | 15..5 | 14..8 |
| 13..8 |
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| CFM | 9493 | 9212 | 8938 | 8335 | 7649 | 6878 |
| 5916 | 4236 |
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| 735 | BHP | 1..79 | 1..86 | 1..92 | 2..03 | 2..10 | 2..13 |
| 2..09 | 1..80 |
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| Sones | 18..9 | 18..6 | 18..3 | 17..6 | 16..8 | 16..2 |
| 15..6 | 14..9 |
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| CFM | 10138 | 9875 | 9617 | 9069 | 8452 | 7769 |
| 7006 | 5949 | 4189 |
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| 785 | BHP | 2..18 | 2..26 | 2..33 | 2..44 | 2..53 | 2..58 |
| 2..59 | 2..49 | 2..11 |
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3 |
| Sones | 21 | 20 | 20 | 19..7 | 18..9 | 18..2 |
| 17..9 | 17..1 | 16..7 |
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| CFM | 10784 | 10537 | 10292 | 9794 | 9225 | 8606 |
| 7932 | 7157 | 6024 |
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| 835 | BHP | 2..62 | 2..70 | 2..78 | 2..91 | 3..02 | 3..08 |
| 3..12 | 3..10 | 2..93 |
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| Sones | 23 | 23 | 22 | 22 | 21 | 20 |
| 19..9 | 19..7 | 18..7 |
| 18..6 |
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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.
37