Filter
Top Products
D
O
N
O
T
S
E
L
E
C
T
T
O
T
H
E
L
E
F
T
O
F
T
H
I
S
S
Y
S
T
E
M
C
U
R
V
E
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
20
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.
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 = 54/61 lbs. (24/28 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
091 099
1/4
VG -Vari-Green is a direct drive brushless DC motor.
720
CFM
546 403
BHP
0.02 0.02
Sones
3.6 3.5
790
CFM
599 471 291
BHP
0.02 0.02 0.02
Sones
4.2 4.1 3.9
C-1/8 860
CFM
652 536 400
BHP
0.03 0.03 0.03
Sones
4.9 4.7 4.5
930
CFM
705 598 481
BHP
0.04 0.04 0.04
Sones
5.6 5.5 5.1
1000
CFM
758 659 552 414
BHP
0.04 0.05 0.05 0.05
Sones
6.4 6.2 5.8 5.6
1070
CFM
811 718 621 512
BHP
0.05 0.06 0.06 0.06
Sones
7.3 7.1 6.7 6.3
B-1/6 1140
CFM
864 777 687 590 457
BHP
0.07 0.07 0.07 0.07 0.07
Sones
8.3 8.1 7.6 7.1 6.8
1285
CFM
974 897 819 736 647 526
BHP
0.09 0.10 0.10 0.10 0.11 0.10
Sones
9.5 9.4 9.0 8.5 8.2 7.9
1435
CFM
1087 1018 949 877 801 721 615 404
BHP
0.13 0.14 0.14 0.14 0.15 0.15 0.15 0.12
Sones
10.7 10.6 10.4 10.0 9.6 9.3 9.0 8.4
1580
CFM
1197 1135 1072 1009 941 872 799 707 583
BHP
0.17 0.18 0.19 0.19 0.19 0.20 0.20 0.20 0.19
Sones
12.1 12.0 11.9 11.5 11.2 10.9 10.6 10.3 9.8
A-1/4 1725
CFM
1307 1250 1192 1135 1076 1013 949 883 806 707
BHP
0.23 0.23 0.24 0.24 0.25 0.25 0.26 0.26 0.26 0.25
Sones
13.6 13.5 13.4 13.2 12.9 12.6 12.3 12.0 11.8 11.5
C-860-
RPM B-1140-RPM A-1725-RPM VG-1725-RPM
Roof Downblast Exhaust
Belt & Direct Drive
GB-091 • G-099
MAXIMUM BHP AT A GIVEN RPM = (RPM/2703)
3
MAXIMUM RPM - GB-091=1710, G-099=1725
TIP SPEED (ft/min) = RPM x 2.929
MAXIMUM MOTOR FRAME SIZE = 56
VG-
1/4
Direct Drive RPM