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Performance certified is for installation type B: Free inlet, Ducted outlet. Power rating (Bhp) does not include transmission losses. Performance ratings do not include the
effects of appurtenances (accessories).
The sound ratings shown are loudness values in fan sones at 1.5 m (5 feet) in a hemispherical free field calculated per AMCA International Standard 301. Values shown are
for installation type B: free inlet hemispherical sone levels.
BSQ 420 - Belt Drive
50
(1270)
58
(1473)
53
7
⁄8
(1368)
58
(1473)
1
1
⁄2 (38)
*18
(457)
*22
(559)
*34
(864)
Damper size = 54 x 54 (1372 x 1372)
Unit weight** = 789 (358)
Housing thickness = 14 ga
Model
Number
Motor HP
Fan
RPM
CFM / Static Pressure in Inches wg
0.125 0.25 0.375 0.5 0.75 1 1.25 1.5 1.75 2
420
420-20 2
270
CFM 9901 8281
BHP 0.68 0.70
Sones 6.0 3.3
349
CFM 13501 12428 11210 9592
BHP 1.41 1.48 1.51 1.49
Sones 9.4 8.7 8.1 7.8
389
CFM 15275 14340 13334 12132
BHP 1.93 2.02 2.08 2.09
Sones 13.2 12.3 11.5 10.8
420-30 3
417
CFM 16500 15633 14714 13745 11026
BHP 2.37 2.46 2.53 2.58 2.52
Sones 16.6 15.7 14.8 13.9 12.5
445
CFM 17704 16910 16068 15188 12941
BHP 2.86 2.96 3.05 3.11 3.12
Sones 20 19.5 18.6 17.7 15.9
420-50 5
487
CFM 19500 18801 18054 17257 15475 13113
BHP 3.71 3.84 3.95 4.02 4.11 4.03
Sones 22 21 21 19.8 18.2 16.9
528
CFM 21244 20625 19937 19231 17747 15850 13154
BHP 4.70 4.85 4.97 5.08 5.22 5.24 4.99
Sones 25 24 23 23 21 20 18.7
420-75 7
1
⁄2
566
CFM 22854 22301 21659 21017 19644 18080 16134 13026
BHP 5.76 5.94 6.07 6.19 6.36 6.46 6.39 5.95
Sones 28 27 26 25 24 24 22 21
604
CFM 24459 23950 23363 22762 21502 20206 18533 16581
BHP 6.98 7.17 7.32 7.45 7.66 7.83 7.84 7.71
Sones 31 30 30 29 28 27 26 25
420-100 10
635
CFM 25765 25281 24743 24171 22996 21762 20341 18681 16692
BHP 8.09 8.29 8.46 8.60 8.85 9.03 9.12 9.09 8.88
Sones 35 33 33 32 31 30 30 29 28
670
CFM 27237 26778 26291 25749 24660 23491 22322 20793 19111 16873
BHP 9.47 9.69 9.88 10.03 10.33 10.52 10.71 10.70 10.61 10.24
Sones 39 37 36 36 34 34 34 33 32 31
MAX Bhp AT A GIVEN RPM = (rpm/304)
3
MAXIMUM RPM = 670
TIP SPEED (ft/min) = rpm x 11.060
MAX NEMA MOTOR FRAME SIZE = 215T
OUTLET VELOCITY (ft/min) = 0.0496 x cfm
0 10 20 30 40 50
0
200
400
600
D
O
N
O
T
S
E
L
E
C
T
T
O
T
H
E
L
E
F
T
OF
T
H
I
S
S
Y
S
T
E
M
C
U
R
V
E
0 5 10 15 20 25 30
0.0
0.5
1.0
1.5
2.0
2.5
Static Pressure in. wg
cfm X 1000
m
3
/hr X 1000
Static Pressure Pa
10 hp
7 1/2 hp
5 hp
3 hp
2 hp
670
605
535
465
395
325
RPM
HP
Density 0.075 lb/ft
3
Dimensions shown in inches (millimeters) and weight is shown in pounds (kilograms).
*Motor cover is optional. Size may be greater depending on motor.
**Weight shown is largest cataloged Open Drip Proof motor.