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Roof Downblast - Exhaust
Belt Drive
GB-500
83
(2108)
64
(1626)
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
Curb Cap Thickness = 0.100
(2.5)
^Approximate Unit Weight = 687 lbs.
All dimensions in inches (millimeters). *May be greater depending on
motor. ^Weight shown is largest cataloged Open Drip-Proof motor.
Motor
Fan
HP
RPM
0
500
CFM
14102
175
BHP
0.50
Sones
6.7
CFM
16117
1
200
0.75
BHP
8.4
Sones
17245
CFM
214
0.92
BHP
9.5
Sones
CFM
19743
1
⁄
245
1.38
1
BHP
2
11.9
Sones
CFM
21677
2
269
BHP
1.83
Sones
14.0
24820
CFM
3
308
2.74
BHP
Sones
17.7
27157
CFM
337
3.59
BHP
19.9
Sones
5
29494
CFM
366
BHP
4.60
22
Sones
CFM
33764
7
1
⁄
419
BHP
6.90
2
Sones
27
35457
CFM
440
8.00
BHP
30
Sones
10
37068
CFM
460
9.14
BHP
32
Sones
Performance certified is for installation type A: Free inlet, Free outlet. Power rating (BHP) does not include transmission losses. Performance ratings include the effects
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.
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.
Values shown are for installation type A: free inlet hemispherical sone levels.
*50
3
⁄
4
(1289)
14
1
⁄
(368)
2
1
3
⁄
(44)
4
(1.6)
(312 kg)
0.125
0.25
0.375
11123
0.57
6.5
13588
10593
0.85
0.83
8.0
7.7
14939
12242
1.04
1.04
9.1
8.7
17749
15481
12983
1.54
1.57
1.53
11.5
11.0
10.7
19873
17857
15752
2.02
2.06
2.08
13.8
13.2
12.7
23263
21627
19752
3.00
3.09
3.11
17.4
16.9
16.2
25739
24253
22614
3.89
4.01
4.06
19.5
19.1
18.5
28188
26834
25429
4.92
5.10
5.20
22
21
21
32624
31467
30265
7.27
7.57
7.70
27
27
26
34371
33279
32134
8.38
8.74
8.87
29
29
29
36030
34991
33900
9.54
9.94
10.10
32
32
32
Volume (cfm x 1000)
Volume (m /hr x 1000)
Static Pressure in Inches wg
0.5
0.625
0.75
MAXIMUM BHP AT A GIVEN RPM = (RPM/210)
TIP SPEED (ft/min) = RPM x 14.137
MAXIMUM MOTOR FRAME SIZE = 256T
17903
15284
3.11
2.96
15.8
15.6
20937
19206
16671
4.08
4.06
3.88
17.9
17.6
17.4
23831
22310
20688
5.20
5.24
5.19
20
19.8
19.5
29015
27607
26276
7.80
7.80
7.84
26
25
24
30989
29679
28373
9.01
9.03
9.05
29
28
27
32805
31625
30342
10.24
10.32
10.32
32
31
30
RPM (Belt)
HP
3
Density 0.075 lb/ft
3
Density 1.2 kg/m
3
0.875
1
1.25
MAXIMUM RPM = 460
18366
4.99
19.4
24940
23486
7.88
7.78
24
23
27107
25801
22407
9.10
9.09
8.73
26
26
29127
27917
25310
10.36
10.41
10.26
29
28
3
25
27
45
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