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Static Pressure (in. wg)
Static Pressure (Pa)
Volume (cfm)
3
Volume (m /hr )
RPM (Belt)
RPM (Direct)
RPM (Vari-Green)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
24
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.
Roof Downblast - Exhaust
Belt & Direct Drive
GB-131 • G-133
1
3
⁄4 (44)
Damper Size = 12 x 12 (305 x 305)
Roof Opening = 14 x 14 (368 x 368)
Shroud Thickness = 0.051 (1.3)
Motor Cover Thickness = 0.040 (1.0)
Curb Cap Thickness = 0.064 (1.6)
^Approximate Unit Weight G/GB = 62/67 lbs. (28/30 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
28
3
⁄8
(721)
4 (102)
*23
3
⁄4
(603)
19
(483)
Motor HP
Fan
RPM
Static Pressure in Inches wg
Belt Direct 0 0.125 0.25 0.375 0.5 0.625 0.75 1 1.25 1.5
131 133
1/4
VG -Vari-Green is a direct drive brushless DC motor.
580
CFM
823 626
BHP
0.02 0.02
Sones
4.5 4.5
720
CFM
1022 879 650
BHP
0.04 0.04 0.04
Sones
5.4 5.4 5.2
C-1/8 860
CFM
1221 1106 962 727
BHP
0.06 0.07 0.07 0.07
Sones
6.6 6.5 6.3 6.0
1000
CFM
1419 1323 1213 1075 867
BHP
0.10 0.11 0.11 0.12 0.11
Sones
8.1 8.0 7.7 7.4 7.0
B-1/6 1140
CFM
1618 1535 1444 1340 1211 1031
BHP
0.15 0.16 0.16 0.17 0.17 0.17
Sones
10.0 9.8 9.6 9.2 8.8 8.5
1250
CFM
1774 1698 1617 1528 1426 1133
BHP
0.19 0.2 0.21 0.22 0.23 0.22
Sones
12.0 11.7 11.3 11.0 10.5 9.7
1315
CFM
1866 1794 1718 1637 1545 1435 1305
BHP
0.22 0.23 0.24 0.25 0.26 0.26 0.26
Sones
13.2 12.8 12.5 12.1 11.7 11.2 10.9
1/3 1440
CFM
2044 1978 1911 1838 1759 1674 1571 1299
BHP
0.29 0.31 0.32 0.33 0.34 0.34 0.35 0.34
Sones
15.0 15.0 15.1 15.1 14.5 13.9 13.4 12.5
1/2
1600
CFM
2271 2212 2152 2088 2023 1873 1783 1686 1425
BHP
0.40 0.42 0.43 0.44 0.45 0.47 0.47 0.48 0.47
Sones
16.2 16.0 15.8 15.6 15.3 14.6 14.2 13.9 13.2
1685
CFM
2391 2335 2279 2219 2158 2020 1946 1857 1654 1312
BHP
0.47 0.48 0.50 0.51 0.52 0.54 0.55 0.56 0.56 0.52
Sones
16.9 16.6 16.3 16.0 15.7 15.1 14.8 14.5 13.9 13.5
3/4 A-1/2 1725
CFM
2448 2393 2338 2281 2220 2159 2089 1935 1746 1474
BHP
0.50 0.52 0.53 0.55 0.56 0.57 0.58 0.59 0.60 0.58
Sones
17.4 17.0 16.7 16.3 15.9 15.6 15.4 14.9 14.3 13.8
C-860-
RPM B-1140-RPM A-1725-RPM VG-1725-RPM
MAXIMUM BHP AT A GIVEN RPM = (RPM/2047)
3
MAXIMUM RPM - GB-131=1725, G-133=1725
TIP SPEED (ft/min) = RPM x 3.436
MAXIMUM MOTOR FRAME SIZE = 56
VG-
3/4
Direct Drive RPM