Roof downblast - belt drive size- : gb • h-gb – Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 26
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
2200
Motor HP
Fan
RPM
Static Pressure in Inches wg
Belt
Direct
.5
.75
1
1.25
1.5
1.75
2
2.25
2.5
2.75
141HP
143HP
1/4
VG-
3/4
1020
CFM
488
BHP
0.08
Sones
6.3
B-1/4
1140
CFM
645
413
BHP
0.11
0.11
Sones
7.7
7.6
1320
CFM
837
700
486
BHP
0.17
0.18
0.17
Sones
10.3
9.8
9.9
1500
CFM
1009
903
774
592
BHP
0.24
0.26
0.26
0.25
Sones
13.1
12.3
12.2
12.4
1/3
1655
CFM
1151
1064
959
833
668
BHP
0.32
0.34
0.35
0.35
0.34
Sones
15.0
14.1
13.3
13.1
13.6
1/2
A-1/2
1725
CFM
1213
1132
1035
932
784
588
BHP
0.36
0.38
0.39
0.39
0.39
0.37
Sones
16.2
15.4
14.7
14.2
14.3
14.9
1812
CFM
1289
1213
1127
1030
911
763
545
BHP
0.41
0.43
0.45
0.46
0.45
0.45
0.41
Sones
17.8
17.2
16.6
15.8
15.6
15.9
16.6
1900
CFM
1366
1294
1218
1127
1033
901
753
BHP
0.47
0.49
0.51
0.53
0.53
0.52
0.51
Sones
19.0
18.4
18.0
17.4
16.8
16.7
17.0
3/4
2050
CFM
1495
1430
1361
1285
1200
1113
991
857
672
BHP
0.58
0.61
0.63
0.65
0.66
0.66
0.66
0.65
0.61
Sones
21.0
20.0
19.8
19.3
18.8
18.6
18.3
18.3
18.6
2170
CFM
1598
1536
1472
1407
1328
1248
1163
1045
919
757
BHP
0.68
0.71
0.73
0.76
0.77
0.78
0.79
0.78
0.77
0.74
Sones
22.0
22.0
21.0
21.0
21.0
21.0
21.0
20.0
19.7
19.8
2200
CFM
1623
1562
1500
1436
1360
1281
1200
1088
968
834
BHP
0.71
0.74
0.76
0.78
0.80
0.82
0.82
0.81
0.80
0.79
Sones
23.0
22.0
22.0
22.0
21.0
21.0
21.0
21.0
20.0
20.0
26
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.
Roof Downblast - Exhaust
Belt & Direct Drive
GB-141HP • G-143HP
Damper Size = 16 x 16
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 G/GB = 75/83 lbs.
(34/38 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
MAXIMUM BHP AT A GIVEN RPM = (RPM/2351)
3
MAXIMUM RPM - GB-141HP=2200, G-143HP=2200
TIP SPEED (ft/min) = RPM x 3.829
MAXIMUM MOTOR FRAME SIZE = 145T
1
3
⁄
4
(44)
4
(102)
*23
3
⁄
4
(603)
22
(559)
28
3
⁄
8
(721)
B-1140
-
RPM
A-1725
-
RPM
VG-2200
-
RPM
Direct Drive RPM