Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 24
A
DO
NO
T S
EL
EC
T
TO
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
24
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-131 • G-133
1
3
⁄
4
(44)
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 = 62/67 lbs.
(28/30 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
28
3
⁄
8
(721)
4
(102)
*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
1
1.25
1.5
131
133
1/4
VG-
3/4
580
CFM
823
626
BHP
0.02
0.02
Sones
4.5
4.5
720
CFM
1022
879
650
BHP
0.04
0.04
0.04
Sones
5.4
5.4
5.2
C-1/8
860
CFM
1221
1106
962
727
BHP
0.06
0.07
0.07
0.07
Sones
6.6
6.5
6.3
6.0
1000
CFM
1419
1323
1213
1075
867
BHP
0.10
0.11
0.11
0.12
0.11
Sones
8.1
8.0
7.7
7.4
7.0
B-1/6
1140
CFM
1618
1535
1444
1340
1211
1031
BHP
0.15
0.16
0.16
0.17
0.17
0.17
Sones
10.0
9.8
9.6
9.2
8.8
8.5
1250
CFM
1774
1698
1617
1528
1426
1133
BHP
0.19
0.2
0.21
0.22
0.23
0.22
Sones
12.0
11.7
11.3
11.0
10.5
9.7
1315
CFM
1866
1794
1718
1637
1545
1435
1305
BHP
0.22
0.23
0.24
0.25
0.26
0.26
0.26
Sones
13.2
12.8
12.5
12.1
11.7
11.2
10.9
1/3
1440
CFM
2044
1978
1911
1838
1759
1674
1571
1299
BHP
0.29
0.31
0.32
0.33
0.34
0.34
0.35
0.34
Sones
15.0
15.0
15.1
15.1
14.5
13.9
13.4
12.5
1/2
1600
CFM
2271
2212
2152
2088
2023
1873
1783
1686
1425
BHP
0.40
0.42
0.43
0.44
0.45
0.47
0.47
0.48
0.47
Sones
16.2
16.0
15.8
15.6
15.3
14.6
14.2
13.9
13.2
1685
CFM
2391
2335
2279
2219
2158
2093
2020
1857
1654
1312
BHP
0.47
0.48
0.50
0.51
0.52
0.54
0.55
0.56
0.56
0.52
Sones
16.9
16.6
16.3
16.0
15.7
15.1
14.8
14.5
13.9
13.5
3/4
A-1/2
1725
CFM
2448
2393
2338
2281
2220
2159
2089
1935
1746
1474
BHP
0.50
0.52
0.53
0.55
0.56
0.57
0.58
0.59
0.60
0.58
Sones
17.4
17.0
16.7
16.3
15.9
15.6
15.4
14.9
14.3
13.8
C-860
-
RPM
B-1140
-
RPM
A-1725
-
RPM
VG-1725
-
RPM
MAXIMUM BHP AT A GIVEN RPM = (RPM/2047)
3
MAXIMUM RPM - GB-131=1725, G-133=1725
TIP SPEED (ft/min) = RPM x 3.436
MAXIMUM MOTOR FRAME SIZE = 56
Direct Drive RPM