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Roof Downblast - Exhaust
Belt Drive
GB-360HP
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 = 460 lbs. (209 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
8
7
⁄8 (225)
*38
1
⁄2
(978)
46
(1168)
Motor
HP
Fan
RPM
Static Pressure in Inches wg
0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75
360HP
1
420
CFM
6097
BHP
0.91
Sones
10.4
435
CFM
6576
BHP
1.02
Sones
10.8
1
1
⁄2 500
CFM
8432 7000
BHP
1.56 1.53
Sones
13.4 12.5
2
525
CFM
9061 7808 5650
BHP
1.79 1.78 1.61
Sones
14.7 13.6 12.7
550
CFM
9681 8589 6998
BHP
2.05 2.06 1.98
Sones
16.0 14.8 14.2
3
590
CFM
10657 9719 8495 6528
BHP
2.50 2.57 2.52 2.32
Sones
18.0 16.3 15.7 14.9
630
CFM
11616 10772 9767 8525 6006
BHP
3.01 3.11 3.10 3.04 2.63
Sones
20 18.6 17.6 16.9 15.7
5
690
CFM
13062 12259 11464 10468 9335 7159
BHP
3.93 4.02 4.11 4.05 3.99 3.60
Sones
24 22 21 20 19.2 18.1
750
CFM
14487 13711 13002 12220 11282 10239 8513
BHP
5.02 5.10 5.22 5.26 5.20 5.13 4.83
Sones
27 25 24 24 23 22 21
7
1
⁄2
803
CFM
15728 14985 14309 13647 12863 11960 10986 9445
BHP
6.13 6.22 6.33 6.46 6.44 6.37 6.30 6.01
Sones
31 30 28 27 26 25 24 23
855
CFM
16918 16236 15568 14946 14315 13544 12676 11761 10368 8273
BHP
7.37 7.47 7.58 7.71 7.82 7.76 7.69 7.61 7.32 6.63
Sones
35 33 33 31 29 29 27 27 26 25
MAXIMUM BHP AT A GIVEN RPM = (RPM/431)
3
MAXIMUM RPM = 855
TIP SPEED (ft/min) = RPM x 9.425
MAXIMUM MOTOR FRAME SIZE = 215T
58
3
⁄4
(1492)