Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 22
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)
RPM
(Direct)
RPM
(Vari-Green)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
22
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
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
101HP
103HP
1/4
VG-
1/2
1300
CFM
571
477
342
BHP
0.06
0.06
0.07
Sones
6.6
5.7
5.3
1445
CFM
635
553
449
243
BHP
0.08
0.09
0.09
0.08
Sones
8.4
7.5
7
6.3
1590
CFM
699
626
537
417
BHP
0.10
0.11
0.12
0.12
Sones
10.4
9.5
9.1
8.3
A-1/4
1725
CFM
758
692
613
521
364
BHP
0.13
0.14
0.15
0.16
0.15
Sones
11.4
10.7
10.6
10.1
10
1880
CFM
826
767
697
618
518
337
BHP
0.17
0.18
0.19
0.20
0.20
0.18
Sones
12.7
12.2
11.9
12
11.4
11.9
2025
CFM
890
836
772
702
622
515
313
BHP
0.21
0.23
0.24
0.24
0.26
0.25
0.22
Sones
14.2
13.6
13.3
13.2
12.6
12
11.4
1/3
2137
CFM
939
889
830
765
693
607
474
BHP
0.25
0.26
0.28
0.28
0.29
0.30
0.28
Sones
15.4
14.8
14.4
14.2
13.4
13.1
12.1
2229
CFM
979
931
875
814
748
674
574
406
BHP
0.28
0.30
0.31
0.32
0.33
0.35
0.33
0.31
Sones
15.8
15.4
14.8
14.5
14.1
13.7
13.2
12.0
1/2
2336
CFM
1026
981
928
871
809
742
661
543
358
BHP
0.33
0.34
0.36
0.36
0.37
0.39
0.40
0.37
0.34
Sones
16.4
16
15.4
14.9
14.7
14
14.1
13.5
13.6
2500
CFM
1098
1056
1008
956
901
840
775
695
583
416
BHP
0.40
0.42
0.43
0.45
0.45
0.46
0.48
0.48
0.46
0.42
Sones
17.8
17.4
16.9
16.7
15.8
15.5
14.8
15.2
15.7
16.6
2550
CFM
1120
1078
1032
982
928
869
807
735
639
497
BHP
0.43
0.44
0.46
0.47
0.47
0.49
0.51
0.52
0.50
0.47
Sones
18.2
17.9
17.4
17.2
16.3
16.1
15.1
15.6
16.2
17.2
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 = 58/63 lbs.
(26/29 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/3165)
3
MAXIMUM RPM = 2550
TIP SPEED (ft/min) = RPM x 2.978
MAXIMUM MOTOR FRAME SIZE = 56
Roof Downblast Exhaust
Belt & Direct Drive
GB-101HP • G-103HP
A-1725
RPM
VG-2550
-
RPM
Direct Drive RPM