Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 19
DO
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E
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C
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O
T
H
E
L
E
F
T
O
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T
H
IS
S
Y
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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
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 = 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 = 54/60 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-
1/4
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
Direct Drive RPM