Roof downblast - exhaust belt drive gb-500 – Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB User Manual
Page 45
45
Roof Downblast - Exhaust
Belt Drive
GB-500
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 = 54 x 54
(1371 x 1371)
Roof Opening = 56½ x 56½
(1435 x 1435)
Shroud Thickness = 0.100
(2.5)
Motor Cover Thickness = 0.064
(1.6)
Curb Cap Thickness = 0.100
(2.5)
^Approximate Unit Weight = 687 lbs.
(312 kg)
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
DO
N
OT
S
EL
EC
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 x 1000)
3
Volume (m /hr x 1000)
RPM
(Belt)
HP
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
83
(2108)
14
1
⁄
2
(368)
*50
3
⁄
4
(1289)
64
(1626)
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0
0.125
0.25
0.375
0.5
0.625
0.75
0.875
1
1.25
500
1
175
CFM
14102
11123
BHP
0.50
0.57
Sones
6.7
6.5
200
CFM
16117
13588
10593
BHP
0.75
0.85
0.83
Sones
8.4
8.0
7.7
214
CFM
17245
14939
12242
BHP
0.92
1.04
1.04
Sones
9.5
9.1
8.7
1
1
⁄
2
245
CFM
19743
17749
15481
12983
BHP
1.38
1.54
1.57
1.53
Sones
11.9
11.5
11.0
10.7
2
269
CFM
21677
19873
17857
15752
BHP
1.83
2.02
2.06
2.08
Sones
14.0
13.8
13.2
12.7
3
308
CFM
24820
23263
21627
19752
17903
15284
BHP
2.74
3.00
3.09
3.11
3.11
2.96
Sones
17.7
17.4
16.9
16.2
15.8
15.6
5
337
CFM
27157
25739
24253
22614
20937
19206
16671
BHP
3.59
3.89
4.01
4.06
4.08
4.06
3.88
Sones
19.9
19.5
19.1
18.5
17.9
17.6
17.4
366
CFM
29494
28188
26834
25429
23831
22310
20688
18366
BHP
4.60
4.92
5.10
5.20
5.20
5.24
5.19
4.99
Sones
22
22
21
21
20
19.8
19.5
19.4
7
1
⁄
2
419
CFM
33764
32624
31467
30265
29015
27607
26276
24940
23486
BHP
6.90
7.27
7.57
7.70
7.80
7.80
7.84
7.88
7.78
Sones
27
27
27
26
26
25
24
24
23
10
440
CFM
35457
34371
33279
32134
30989
29679
28373
27107
25801
22407
BHP
8.00
8.38
8.74
8.87
9.01
9.03
9.05
9.10
9.09
8.73
Sones
30
29
29
29
29
28
27
26
26
25
460
CFM
37068
36030
34991
33900
32805
31625
30342
29127
27917
25310
BHP
9.14
9.54
9.94
10.10
10.24
10.32
10.32
10.36
10.41
10.26
Sones
32
32
32
32
32
31
30
29
28
27
MAXIMUM BHP AT A GIVEN RPM = (RPM/210)
3
MAXIMUM RPM = 460
TIP SPEED (ft/min) = RPM x 14.137
MAXIMUM MOTOR FRAME SIZE = 256T