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LB/LBP 21
Belt Drive
43
(1092)
1
⁄
3
30
4
(44)
(762)
LBP Dimensions
36
(914)
30
1
⁄
3
4
(762)
(44)
Model
Motor
Number
HP
LB/LBP-21-4
1/4
LB/LBP-21-3
1/3
LB/LBP-21-5
1/2
LB/LBP-21-7
3/4
LB/LBP-21-10
1
LB/LBP-21-15
1
⁄
1
2
LB/LBP-21-20
2
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.
16
LB Dimensions
51
23
(1295)
(584)
30
(762)
46
19
(1168)
(483)
30
(762)
Fan
RPM
0
CFM
2820
465
BHP
0.12
Sones
6.6
CFM
3609
595
BHP
0.24
Sones
8.8
CFM
3948
651
BHP
0.32
Sones
10.1
CFM
4239
699
BHP
0.39
Sones
11.6
CFM
4531
747
BHP
0.48
Sones
13.4
CFM
4858
801
BHP
0.59
Sones
15.5
CFM
5186
855
BHP
0.72
Sones
16.7
CFM
5452
899
BHP
0.83
Sones
17.1
CFM
6126
1010
BHP
1.18
Sones
20
CFM
6532
1077
BHP
1.43
Sones
22
CFM
7278
1200
BHP
1.98
Sones
26
400
23
300
(584)
200
6
(152)
100
0
24
⁄
1
2
(622)
CFM / Static Pressure in Inches wg
0.25
0.375
0.5
0.625
1732
0.13
5.2
2938
2457
0.28
0.28
7.8
6.9
3371
2970
2354
0.36
0.36
0.34
8.8
8.2
6.9
3724
3362
2954
1964
0.44
0.45
0.45
0.38
9.9
9.3
8.6
7.1
4056
3741
3390
2909
0.53
0.54
0.55
0.53
11.2
10.4
9.8
9.1
4424
4157
3833
3491
0.65
0.66
0.67
0.68
12.9
11.8
11.3
10.8
4790
4553
4261
3954
0.79
0.8
0.81
0.82
14.4
13.3
12.8
12.1
5087
4858
4602
4313
0.91
0.93
0.94
0.95
15.4
14.5
13.9
13.4
5826
5614
5415
5183
1.26
1.3
1.32
1.34
18.9
18.1
17.3
16.6
6260
6068
5877
5691
1.52
1.56
1.59
1.61
21
20
19.4
18.8
7034
6890
6712
6542
2.07
2.12
2.18
2.2
25
25
24
23
2.0
1.5
1.0
0.5
0.0
0
1000
2000
3000
4000
cfm
0
2
4
6
3
m
/hr X 1000
LB-21
Hood Thickness
22 ga
Cover Thickness
-
Louver Thickness
-
Curb Cap Thickness
0.064
(0.029)
Damper Size Square
18
(457)
Roof Opening Square
20
⁄
1
(521)
2
Galvanized,
Weight*
145
(66)
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.
0.75
1
1.25
MAX. BHP AT A GIVEN RPM - (rpm/910)
MAXIMUM FRPM = 1200
TIP SPEED = rpm x 5.596
MAX. MOTOR FRAME SIZE = 145T
2937
0.64
10.1
3608
0.82
11.5
4019
2894
0.96
0.86
12.7
11.7
4926
4386
3369
1.35
1.36
1.24
16.2
15.0
14.0
5451
4965
4395
1.62
1.65
1.63
18.2
17.3
16.4
6375
5954
5517
2.22
2.25
2.28
23
22
21
RPM
HP
Density 0.075 lb/ft
3
5000
6000
7000
8000
8
10
12
LBP-21
-
0.064
(0.029)
0.081
(0.036)
0.064
(0.029)
18
(457)
20
⁄
1
(521)
2
Aluminum,
191
(86)
1.5
1.75
3
5013
4122
2.26
2.11
20
18.5
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