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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 power level ratings shown are in decibels, referred to 10-12 watts, calculated per AMCA Standard 301. Values shown
are for inlet LwiA sound power levels and inlet hemispherical sone levels for installation type B: Free inlet, Ducted outlet, calculated per AMCA Standard 301. The AMCA
Certified Ratings Seal applies to air performance and LwiA values only.
SWB-344-AF - Belt Drive
Series 300
Wheel Diameter = 44
1
⁄2 (1130)
Shaft Diameter = 2
7
⁄16 (62)
Outlet Area = 11.39 ft
2
(1.06 m
2
)
^Approximate Unit Weight = 1997 lb. (908 kg)
All dimensions in inches (millimeters)
For additional discharge positions see page 13
^Weight shown includes largest cataloged Open Drip Proof motor and weatherhood
Maximum BHP at a given RPM = (RPM/291)
3
(Maximum KW at a given RPM = (RPM/321)
3
)
Maximum RPM = 860
Tip Speed (ft/min.) = RPM x 11.65
(Tip Speed (m/s) = RPM x 0.0592)
Maximum Motor Frame Size = 324T
98
5
⁄8
(2505)
36
3
⁄4 (933)
53
7
⁄8 (1368)
3
1
⁄2
(89)
46
5
⁄8
(1184)
52
(1321)
47
1
⁄8
(1197)
73
3
⁄8
(1864)
78
7
⁄8
(2003)
50 (1270)
70
5
⁄16 (1786)
75 (1905)
38
3
⁄16
(970)
35
1
⁄4
(895)
50
1
⁄2
(1283)
32
5
⁄16
(821)
4
11
⁄16
(119)
CFM OV
Static Pressure in Inches wg
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
15000 1316
RPM 376 433 484 532
BHP 2.03 3.26 4.56 5.86
Sones / LwiA 10.1 / 71 11.8 / 72 13.9 / 75 15.5 / 77
17000 1492
RPM 411 463 511 555 597
BHP 2.56 3.94 5.38 6.85 8.32
Sones / LwiA 12 / 73 13.7 / 75 15.6 / 77 16.8 / 78 18.2 / 79
19000 1668
RPM 447 494 539 581 621 659 694
BHP 3.20 4.74 6.29 7.93 9.57 11.2 12.9
Sones / LwiA 14.3 / 76 15.8 / 77 17.2 / 78 18.6 / 79 19.9 / 81 21 / 82 22 / 82
21000 1843
RPM 485 528 570 609 646 682 717 750
BHP 3.97 5.64 7.34 9.09 10.9 12.7 14.5 16.4
Sones / LwiA 16.9 / 78 18 / 79 19.2 / 80 21 / 81 22 / 82 23 / 83 23 / 83 24 / 84
23000 2019
RPM 524 562 601 639 674 707 740 773 804 833
BHP 4.87 6.66 8.54 10.4 12.3 14.4 16.3 18.3 20.3 22.3
Sones / LwiA 19.5 / 81 20 / 81 22 / 82 23 / 83 24 / 84 24 / 84 25 / 85 25 / 85 26 / 86 26 / 86
25000 2194
RPM 563 598 634 670 703 736 766 797 827 856
BHP 5.92 7.83 9.87 11.9 13.9 16.1 18.2 20.4 22.5 24.7
Sones / LwiA 22 / 83 23 / 83 24 / 84 26 / 85 26 / 85 26 / 85 26 / 86 27 / 86 27 / 87 28 / 88
27000 2370
RPM 602 634 668 701 734 765 795 823 851
BHP 7.12 9.16 11.3 13.5 15.7 17.9 20.2 22.6 25.0
Sones / LwiA 25 / 85 26 / 85 27 / 86 27 / 86 27 / 86 27 / 87 28 / 87 28 / 88 29 / 88
29000 2546
RPM 642 672 703 734 765 795 823 851
BHP 8.50 10.66 12.9 15.3 17.6 20.0 22.4 24.9
Sones / LwiA 28 / 87 29 / 88 29 / 87 29 / 87 29 / 87 29 / 88 29 / 88 30 / 89
31000 2721
RPM 682 711 739 769 797 826 854
BHP 10.1 12.4 14.7 17.2 19.8 22.3 24.8
Sones / LwiA 31 / 89 31 / 89 31 / 89 31 / 89 30 / 89 31 / 89 31 / 90
33000 2897
RPM 722 750 775 803 831 858
BHP 11.8 14.2 16.7 19.4 22.1 24.8
Sones / LwiA 33 / 90 33 / 90 33 / 90 33 / 90 33 / 90 33 / 90
35000 3072
RPM 762 789 813 839
BHP 13.8 16.3 19.0 21.7
Sones / LwiA 35 / 92 35 / 92 35 / 92 35 / 92
Static Pressure (in. wg)
Volume (cfm X 1000)
Volume (m
3
/hr x 1000)
Static Pressure (Pa x 100)
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 20 40 60
0
2
4
6
8
10
12
14
0 5 10 15 20 25 30 35 40 45
0
1
2
3
4
5
6
420 420
498 498
570 570
627 627
718 718
790 790
860 860
30 30
25 25
20 20
15 15
10 10
7½ 7½
5 5
3 3
SWB-344-AF
RPM
HP
Density 0.075 lb/ft
3
SWB-344-AF