Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 21
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
1350
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
21
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.
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
1.25
101
103
1/4
VG-
1/4
720
CFM
610
477
BHP
0.02
0.02
Sones
3.8
2.7
C-1/8
860
CFM
729
623
473
BHP
0.03
0.04
0.04
Sones
4.6
3.7
2.9
1000
CFM
848
753
654
481
BHP
0.05
0.05
0.06
0.05
Sones
5.5
4.8
4.4
3.4
B-1/6
1140
CFM
966
883
805
702
507
BHP
0.07
0.08
0.09
0.09
0.08
Sones
6.6
6.0
5.7
5.2
4.1
1245
CFM
1055
978
908
824
715
BHP
0.10
0.10
0.11
0.11
0.11
Sones
7.5
7.0
6.7
6.3
5.7
1350
CFM
1144
1073
1006
938
851
731
BHP
0.12
0.13
0.13
0.14
0.14
0.14
Sones
8.5
8.1
7.8
7.7
7.2
6.7
1450
CFM
1229
1162
1099
1041
965
878
750
BHP
0.15
0.16
0.16
0.17
0.17
0.17
0.17
Sones
9.3
9.0
8.7
8.4
8.0
7.5
6.9
1555
CFM
1318
1255
1196
1140
1079
1005
917
791
BHP
0.19
0.19
0.20
0.21
0.22
0.22
0.22
0.21
Sones
10.2
10.0
9.7
9.4
8.9
8.4
8.0
7.5
1660
CFM
1407
1348
1292
1238
1187
1122
1050
963
841
BHP
0.23
0.23
0.24
0.25
0.26
0.26
0.26
0.26
0.25
Sones
11.4
11.1
10.7
10.4
10.1
9.6
9.1
8.7
8.1
1/3
A-1/4
1725
CFM
1462
1405
1351
1298
1250
1193
1126
1052
955
BHP
0.25
0.26
0.27
0.28
0.29
0.29
0.29
0.29
0.29
Sones
12.2
11.9
11.5
11.2
10.9
10.3
10.0
9.5
9.0
1800
CFM
1525
1471
1419
1368
1321
1270
1209
1142
1065
793
BHP
0.29
0.30
0.30
0.31
0.33
0.33
0.33
0.33
0.33
0.30
Sones
13.3
12.8
12.5
12.4
12.2
11.4
10.9
10.6
10.2
9.3
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 = 54/61 lbs.
(24/28 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)
MAXIMUM BHP AT A GIVEN RPM = (RPM/2593)
3
MAXIMUM RPM = 1800
TIP SPEED (ft/min) = RPM x 2.913
MAXIMUM MOTOR FRAME SIZE = 56
Roof Downblast Exhaust
Belt & Direct Drive
GB-101 • G-103
C-860
-
RPM
B-1140
-
RPM
A-1725
-
RPM
VG-1725
-
RPM
Direct Drive RPM