Roof downblast - belt drive size- : gb • h-gb, Roof downblast - exhaust belt drive gb-161hp – Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 28
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Roof Downblast - Belt Drive
Size- : GB • H-GB
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 = 16 x 16
(406 x 406)
Roof Opening = 18½ x 18½
(470 x 470)
Shroud Thickness = 0.051
(1.3)
Motor Cover Thickness = 0.040
(1.0)
Curb Cap Thickness = 0.064
(1.6)
^Approximate Unit Weight = 88 lbs.
(40 kg)
All dimensions in inches (millimeters). *May be greater depending on motor.
^Weight shown is largest cataloged Open Drip-Proof motor.
Roof Downblast - Exhaust
Belt Drive
GB-161HP
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0.5
0.625
0.75
1
1.25
1.5
1.75
2
2.25
2.5
161HP
1/4
825
CFM
702
BHP
0.11
Sones
6.5
960
CFM
1093
919
585
BHP
0.18
0.17
0.15
Sones
7.7
7.6
8.0
1095
CFM
1380
1271
1139
589
BHP
0.26
0.26
0.26
0.21
Sones
9.0
9.0
8.9
9.5
1/3
1210
CFM
1606
1514
1416
1149
BHP
0.34
0.35
0.35
0.34
Sones
10.6
10.3
10.4
10.3
1/2
1270
CFM
1718
1636
1545
1333
949
BHP
0.39
0.40
0.40
0.41
0.37
Sones
11.4
11.2
11.1
11.1
11.4
1330
CFM
1829
1753
1668
1483
1204
BHP
0.44
0.45
0.46
0.47
0.45
Sones
12.3
12.1
11.9
12.1
12.0
1390
CFM
1938
1865
1789
1619
1399
1032
BHP
0.50
0.51
0.52
0.53
0.53
0.48
Sones
13.3
13.0
12.8
12.7
12.7
13.1
3/4
1485
CFM
2109
2041
1973
1822
1654
1416
1012
BHP
0.60
0.61
0.63
0.64
0.65
0.63
0.57
Sones
14.9
14.7
14.4
13.8
13.7
14.0
14.7
1580
CFM
2275
2214
2150
2016
1868
1704
1447
1034
BHP
0.72
0.73
0.75
0.77
0.77
0.791
0.75
0.67
Sones
16.7
16.7
16.4
15.5
14.7
14.8
15.4
16.6
1
1660
CFM
2414
2357
2297
2175
2037
1887
1702
1441
996
BHP
0.82
0.84
0.85
0.89
0.89
0.91
0.90
0.86
0.75
Sones
18.3
18.8
18.3
16.7
16.2
15.8
15.8
17.1
20
1740
CFM
2551
2497
2442
2325
2200
2066
1917
1714
1452
987
BHP
0.94
0.96
0.97
1.01
1.03
1.03
1.05
1.03
0.98
0.85
Sones
20
21
21
18.4
17.5
17.2
16.8
17.2
19.2
28
D
O
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)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
MAXIMUM BHP AT A GIVEN RPM = (RPM/1708)
3
MAXIMUM RPM = 1740
TIP SPEED (ft/min) = RPM x 4.352
MAXIMUM MOTOR FRAME SIZE = 145T
1
3
⁄
4
(44)
4
(102)
*23
3
⁄
4
(603)
22
(559)
28
3
⁄
8
(721)