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LB Dimensions
LBP Dimensions
1
3
⁄4
(44)
1
3
⁄4
(44)
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 in the airstream. The sound ratings shown are loudness values in fan sones at 5 feet (1.5 m) in a hemispherical free field calculated per AMCA Standard 301. Values
shown are for installation type A: Free inlet hemispherical sones.
LB/LBP 18
Belt Drive
0246810
0
200
400
600
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
0 1000 2000 3000 4000 5000 6000
0.0
0.5
1.0
1.5
2.0
2.5
Static Pressure in. wg
cfm
m
3
/hr X 1000
Static Pressure Pa
1/4 hp
1/3 hp
1/2 hp
3/4 hp
1 hp
1 1/2 hp
2 hp
1460
RPM
HP
Density 0.075 lb/ft
3
1261
1062
863
664
465
Model
Number
Motor
HP
Fan
RPM
CFM / Static Pressure in Inches wg
0 0.125 0.25 0.5 0.75 1 1.25 1.5 1.75 2
LB/LBP-18-4 1/4
465
CFM 1753 1422
BHP 0.056 0.064
Sones 3.6 2.7
562
CFM 2119 1871 1522
BHP 0.099 0.108 0.114
Sones 4.9 4.1 3.4
755
CFM 2847 2671 2474 1925
BHP 0.24 0.25 0.27 0.27
Sones 8.7 7.9 7.4 6.5
LB/LBP-18-3 1/3 826
CFM 3115 2957 2778 2324
BHP 0.31 0.33 0.34 0.36
Sones 10.2 9.5 8.9 8.0
LB/LBP-18-5 1/2
888
CFM 3348 3203 3039 2638 2110
BHP 0.39 0.4 0.42 0.45 0.44
Sones 11.7 11.0 10.4 9.4 8.7
949
CFM 3578 3442 3292 2936 2498
BHP 0.48 0.49 0.51 0.54 0.55
Sones 13.4 13.0 12.0 11.0 10.3
LB/LBP-18-7 3/4 1085
CFM 4091 3972 3847 3575 3218 2822
BHP 0.71 0.73 0.75 0.79 0.82 0.82
Sones 16.8 16.2 15.5 14.6 13.4 12.9
LB/LBP-18-10 1 1141
CFM 4302 4189 4073 3814 3493 3140 2674
BHP 0.83 0.84 0.86 0.91 0.94 0.96 0.93
Sones 18.0 17.3 16.7 15.9 14.8 14.1 13.8
LB/LBP-18-15 1
1
⁄2
1286
CFM 4849 4749 4648 4423 4183 3880 3568 3208
BHP 1.19 1.2 1.22 1.27 1.32 1.35 1.37 1.35
Sones 21 20 19.8 19.2 18.5 17.8 17.4 17.1
1375
CFM 5185 5091 4997 4790 4576 4311 4025 3719 3382
BHP 1.45 1.47 1.49 1.54 1.59 1.63 1.66 1.67 1.65
Sones 24 23 22 21 21 20 19.9 19.6 19.5
LB/LBP-18-20 2 1460
CFM 5505 5417 5328 5138 4936 4714 4446 4176 3874 3538
BHP 1.73 1.76 1.78 1.83 1.88 1.93 1.98 2 2 1.97
Sones 26 25 24 23 23 22 22 22 22 22
MAX. BHP AT A GIVEN RPM - (rpm/1157)
3
MAXIMUM FRPM = 1460
TIP SPEED = rpm x 4.843
MAX. MOTOR FRAME SIZE = 145T
30
(762)
39
(991)
21
(533)
17
1
⁄2
(445)
4
1
⁄2
(114)
36
(914)
46
(1168)
24
1
⁄2
(622)
19
(483)
40
(1016)
30
(762)
30
(762)
30
(762)
LB-18 LBP-18
Hood Thickness 22 ga -
Cover Thickness - 0.064 (0.029)
Louver Thickness - 0.081 (0.036)
Curb Cap Thickness 0.064 (0.029) 0.064 (0.029)
Damper Size Square 18 (457) 18 (457)
Roof Opening Square 20
1
⁄2 (521) 20
1
⁄2 (521)
Weight*
Galvanized,
135
(61)
Aluminum,
179 (81)
All dimensions are in inches (millimeters). Weight in pounds
(kilograms). *Weight shown is the largest cataloged
Open Drip Proof motor. See page 8 for severe duty LBP
dimensions.