Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 20
DO
N
O
T
S
E
L
E
C
T
T
O
T
H
E
L
E
F
T
O
F
T
H
IS
S
Y
S
T
E
M
C
U
R
V
E
Static Pr
essur
e (in. wg)
Static Pr
essur
e (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 = 14½ x 14½
(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-
1/4
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
Direct Drive RPM