Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 23
DO
NO
T
SE
LE
C
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
23
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 = 58/66 lbs.
(26/30 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)
Roof Downblast Exhaust
Belt & Direct Drive
GB-121 • G-123
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
121
123
1/4
VG-
1/2
580
CFM
704
515
BHP
0.02
0.02
Sones
3.2
3.3
720
CFM
873
735
523
BHP
0.03
0.04
0.04
Sones
4.2
4.3
4.1
C-1/8
860
CFM
1043
932
796
580
BHP
0.05
0.06
0.06
0.06
Sones
5.4
5.5
5.2
5.2
1000
CFM
1213
1119
1013
883
694
BHP
0.08
0.09
0.09
0.10
0.09
Sones
6.7
6.8
6.7
6.4
6.4
B-1/6
1140
CFM
1383
1300
1213
1112
993
831
BHP
0.12
0.13
0.14
0.14
0.14
0.14
Sones
8.4
8.4
8.4
8.1
7.9
7.8
1265
CFM
1535
1460
1384
1299
1204
1093
950
BHP
0.16
0.17
0.18
0.19
0.19
0.20
0.19
Sones
10.2
10.1
10.1
9.9
9.7
9.6
9.4
1395
CFM
1692
1625
1557
1484
1404
1315
1214
907
BHP
0.21
0.23
0.24
0.25
0.26
0.26
0.26
0.24
Sones
12.5
12.4
12.3
12.2
12.0
11.7
11.5
11.3
1/3
1475
CFM
1789
1726
1661
1594
1521
1441
1356
1132
BHP
0.25
0.27
0.28
0.29
0.30
0.31
0.31
0.31
Sones
13.5
13.4
13.3
13.2
13.0
12.7
12.4
12.0
1550
CFM
1880
1820
1759
1696
1629
1555
1475
1289
974
BHP
0.29
0.31
0.32
0.33
0.34
0.35
0.36
0.36
0.33
Sones
14.6
14.5
14.3
14.2
14.0
13.8
13.5
12.9
12.4
1/2
1635
CFM
1983
1926
1868
1810
1747
1680
1608
1446
1231
BHP
0.34
0.36
0.37
0.39
0.40
0.41
0.42
0.43
0.41
Sones
15.9
15.8
15.6
15.4
15.3
15.0
14.8
13.9
13.4
A-1/2
1725
CFM
2093
2038
1984
1928
1871
1810
1743
1600
1426
1180
BHP
0.40
0.42
0.44
0.45
0.46
0.47
0.48
0.50
0.50
0.47
Sones
17.4
17.2
17.0
16.8
16.7
16.4
16.2
15.5
14.9
14.0
C-860
-
RPM
B-1140
-
RPM
A-1725
-
RPM
VG-1725
-
RPM
MAXIMUM BHP AT A GIVEN RPM = (RPM/2170)
3
MAXIMUM RPM = 1725
TIP SPEED (ft/min) = RPM x 3.420
MAXIMUM MOTOR FRAME SIZE = 56
Direct Drive RPM