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Roof Downblast - Exhaust
Belt Drive
GB-360
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 = 36 x 36 (914 x 914)
Roof Opening = 38 x 38 (978 x 978)
Shroud Thickness = 0.080 (2.0)
Motor Cover Thickness = 0.064 (1.6)
Curb Cap Thickness = 0.080 (2.0)
^Approximate Unit Weight = 415 lbs. (188 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
I
S
S
Y
S
T
E
M
C
U
R
V
E
Static Pressure (in. wg)
Static Pressure (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
58
3
⁄4
(1492)
8
7
⁄8 (225)
*38
1
⁄2
(978)
46
(1168)
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0 0.125 0.25 0.375 0.5 0.625 0.75 1 1.25 1.5
360
1/2
300
CFM
8024 7070 5804
BHP
0.40 0.43 0.44
Sones
7.6 6.6 5.6
325
CFM
8693 7830 6756 5001
BHP
0.51 0.54 0.56 0.51
Sones
8.7 7.7 6.8 5.6
3/4 365
CFM
9763 9024 8109 7013
BHP
0.72 0.76 0.79 0.78
Sones
10.8 10.0 8.9 7.9
1 410
CFM
10966 10330 9558 8686 7641
BHP
1.02 1.07 1.11 1.12 1.11
Sones
13.7 13.3 11.9 10.9 9.6
1
1
⁄2 460
CFM
12304 11737 11085 10360 9568 8607 7096
BHP
1.45 1.50 1.55 1.58 1.59 1.56 1.46
Sones
15.9 15.6 14.8 14.1 13.1 12.1 10.9
2
483
CFM
12919 12379 11776 11109 10355 9517 8488
BHP
1.67 1.73 1.78 1.82 1.83 1.83 1.78
Sones
17.0 16.7 16.1 15.5 14.8 13.7 12.9
505
CFM
13507 12991 12431 11795 11096 10368 9473
BHP
1.91 1.97 2.02 2.07 2.09 2.10 2.07
Sones
18.1 17.8 17.3 16.8 16.5 15.5 14.7
3
543
CFM
14524 14043 13551 12959 12350 11679 10965 8917
BHP
2.38 2.44 2.5 2.55 2.59 2.60 2.60 2.46
Sones
20 19.8 19.4 18.9 18.6 17.8 16.9 15.6
580
CFM
15513 15064 14614 14077 13523 12917 12289 10813
BHP
2.90 2.96 3.03 3.09 3.14 3.17 3.18 3.13
Sones
22 22 22 21 21 20 19.1 17.6
5
633
CFM
16931 16519 16107 15654 15146 14639 14072 12892 11465
BHP
3.77 3.84 3.91 3.98 4.04 4.10 4.12 4.13 4.05
Sones
26 25 25 24 24 23 23 21 19.7
685
CFM
18322 17941 17560 17179 16711 16243 15774 14710 13535 12119
BHP
4.77 4.85 4.93 5.01 5.07 5.14 5.20 5.23 5.21 5.10
Sones
30 30 29 29 28 28 26 24 23 22
MAXIMUM BHP AT A GIVEN RPM = (RPM/394)
3
MAXIMUM RPM = 685
TIP SPEED (ft/min) = RPM x 9.425
MAXIMUM MOTOR FRAME SIZE = 215T