Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 25
DO
N
O
T
S
E
LE
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
25
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-141 • G-143
1
3
⁄
4
(44)
Damper Size = 16 x 16
(406 x 406)
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 = 77/86 lbs.
(35/39 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)
22
(559)
Motor HP
Fan
RPM
Static Pressure in Inches wg
Belt
Direct
0
0.125
0.25
0.375
0.5
0.75
1
1.25
1.5
1.75
141
143
1/4
VG-
3/4
580
CFM
1076
855
BHP
0.04
0.04
Sones
4.7
4.7
720
CFM
1336
1169
938
BHP
0.07
0.08
0.08
Sones
5.8
5.9
5.2
C-1/8
860
CFM
1595
1457
1304
1085
BHP
0.12
0.13
0.13
0.13
Sones
7.1
7.0
6.6
6.1
950
CFM
1762
1636
1506
1344
1085
BHP
0.16
0.17
0.18
0.18
0.17
Sones
8.1
8.0
7.6
7.1
6.5
1075
CFM
1994
1882
1771
1647
1490
BHP
0.24
0.25
0.26
0.26
0.26
Sones
10.0
9.9
9.4
8.9
8.4
1/3
B-1/3
1140
CFM
2115
2008
1905
1792
1660
1233
BHP
0.28
0.30
0.31
0.31
0.31
0.29
Sones
11.0
10.9
10.4
9.9
9.4
8.2
1/2
1265
CFM
2347
2250
2158
2062
1955
1677
1048
BHP
0.39
0.40
0.41
0.42
0.42
0.42
0.35
Sones
12.9
12.7
12.3
11.9
11.4
10.4
8.8
VG-1
1360
CFM
2523
2433
2347
2259
2166
1943
1602
BHP
0.48
0.50
0.51
0.52
0.52
0.53
0.51
Sones
14.6
14.3
13.9
13.5
13.1
12.2
11.0
3/4
1450
CFM
2690
2606
2524
2443
2358
2165
1905
1501
BHP
0.58
0.60
0.61
0.63
0.63
0.64
0.63
0.59
Sones
16.2
15.9
15.6
15.2
14.7
13.8
12.9
11.7
1550
CFM
2875
2797
2719
2644
2566
2396
2191
1910
1297
BHP
0.71
0.73
0.74
0.76
0.77
0.78
0.79
0.76
0.65
Sones
17.7
18.0
17.4
17.2
16.8
15.0
14.8
14.8
14.9
1
A-1
1725
CFM
3200
3129
3059
2991
2923
2782
2619
2427
2184
1815
BHP
0.98
1.00
1.02
1.03
1.05
1.07
1.07
1.09
1.06
1.00
Sones
20.0
21.0
20.0
19.9
19.6
18.5
17.2
17.0
16.8
16.7
C-860
-
RPM
B-1140
-
RPM
A-1725
-
RPM
VG-1725
-
RPM
MAXIMUM BHP AT A GIVEN RPM = (RPM/1676)
3
MAXIMUM RPM - GB-141=1725, G-143=1725
TIP SPEED (ft/min) = RPM x 3.829
MAXIMUM MOTOR FRAME SIZE = 145T
Direct Drive RPM