Roof downblast - exhaust belt drive gb-260 – Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 37
37
Roof Downblast - Exhaust
Belt Drive
GB-260
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.
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.
1
3
⁄
4
(44)
Damper Size = 30 x 30
(762 x 762)
Roof Opening = 32½ x 32½
(826 x 826)
Shroud Thickness = 0.064
(1.6)
Motor Cover Thickness = 0.051
(1.3)
Curb Cap Thickness = 0.064
(1.6)
^Approximate Unit Weight = 305 lbs.
(138 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
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 x 1000)
3
Volume (m /hr x 1000)
RPM
(Belt)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
50
(1270)
8
1
⁄
4
(210)
*36
(914)
40
(1016)
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0
0.125
0.25
0.5
0.75
1
1.25
1.5
1.75
2
260
1/4
300
CFM
3875
3121
1727
BHP
0.12
0.14
0.12
Sones
8.0
7.1
7.4
365
CFM
4714
4130
3393
BHP
0.22
0.25
0.26
Sones
9.2
8.8
8.6
1/3
405
CFM
5231
4716
4095
BHP
0.30
0.33
0.35
Sones
10.4
10.3
10.3
1/2
465
CFM
6005
5570
5063
3745
BHP
0.45
0.50
0.52
0.53
Sones
11.4
10.9
10.4
9.6
3/4
520
CFM
6716
6324
5898
4869
3008
BHP
0.63
0.68
0.72
0.75
0.64
Sones
12.9
12.1
11.3
10.3
9.4
1
580
CFM
7491
7137
6775
5912
4826
BHP
0.88
0.93
0.98
1.04
1.03
Sones
14.4
13.7
13.0
12.2
11.0
1
1
⁄
2
665
CFM
8588
8278
7979
7274
6474
5465
3608
BHP
1.33
1.39
1.44
1.53
1.57
1.55
1.29
Sones
16.7
16.2
15.8
15.0
14.2
13.3
12.8
2
700
CFM
9041
8746
8460
7811
7068
6227
4912
BHP
1.55
1.61
1.67
1.77
1.82
1.83
1.71
Sones
17.8
17.4
17.0
16.2
15.5
14.8
13.8
735
CFM
9493
9212
8938
8335
7649
6878
5916
4236
BHP
1.79
1.86
1.92
2.03
2.10
2.13
2.09
1.80
Sones
18.9
18.6
18.3
17.6
16.8
16.2
15.6
14.9
3
785
CFM
10138
9875
9617
9069
8452
7769
7006
5949
4189
BHP
2.18
2.26
2.33
2.44
2.53
2.58
2.59
2.49
2.11
Sones
21
20
20
19.7
18.9
18.2
17.9
17.1
16.7
835
CFM
10784
10537
10292
9794
9225
8606
7932
7157
6024
4294
BHP
2.62
2.70
2.78
2.91
3.02
3.08
3.12
3.10
2.93
2.49
Sones
23
23
22
22
21
20
19.9
19.7
18.7
18.6
MAXIMUM BHP AT A GIVEN RPM = (RPM/572)
3
MAXIMUM RPM = 835
TIP SPEED (ft/min) = RPM x 7.985
MAXIMUM MOTOR FRAME SIZE = 184T