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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
19
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-081 • G-098
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 = 54/60 lbs. (24/27 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
1
3
⁄4 (44)
24
3
⁄8
(619)
4
3
⁄8 (111)
*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 0.875 1 1.125
081 098
1/6
VG -Vari-Green is a direct drive brushless DC motor.
720
CFM
361 272
BHP
0.01 0.01
Sones
3.0 2.7
790
CFM
396 315 181
BHP
0.02 0.02 0.02
Sones
3.5 3.2 3
C-1/8 860
CFM
431 358 261
BHP
0.02 0.02 0.02
Sones
4.0 3.7 3.4
930
CFM
466 399 323
BHP
0.03 0.03 0.03
Sones
4.6 4.4 4.0
1000
CFM
501 439 372 259
BHP
0.03 0.04 0.04 0.04
Sones
5.3 5.1 4.7 4.4
1070
CFM
536 478 416 338
BHP
0.04 0.04 0.05 0.05
Sones
5.9 5.8 5.4 5.0
B-1/6 1140
CFM
571 517 460 396 283
BHP
0.05 0.05 0.06 0.06 0.05
Sones
6.6 6.5 6.1 5.7 5.5
1315
CFM
659 612 564 513 456 362
BHP
0.08 0.08 0.08 0.09 0.09 0.08
Sones
8.3 8.1 7.8 7.4 7.0 6.9
1490
CFM
746 706 663 621 574 525 452 353
BHP
0.11 0.12 0.12 0.12 0.12 0.12 0.12 0.11
Sones
10.1 9.9 9.8 9.3 8.9 8.6 8.5 8.4
1670
CFM
836 800 763 725 686 645 603 550 466 377
BHP
0.16 0.16 0.16 0.17 0.17 0.17 0.17 0.18 0.17 0.16
Sones
12.0 11.9 11.7 11.4 11.0 10.7 10.4 10.1 10.0 9.9
1/4 A-1/4 1725
CFM
864 829 793 756 719 679 640 592 527 441
BHP
0.17 0.18 0.18 0.18 0.19 0.19 0.19 0.19 0.19 0.18
Sones
12.7 12.5 12.3 12.1 11.7 11.4 11.1 10.8 10.6 10.5
MAXIMUM BHP AT A GIVEN RPM = (RPM/2985)
3
MAXIMUM RPM - GB-081=1710, G-098=1725
TIP SPEED (ft/min) = RPM x 2.929
MAXIMUM MOTOR FRAME SIZE = 56
C-860-RPM B-1140-RPM A-1725-RPM VG-1725-RPM
VG-
1/4
Direct Drive RPM