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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 AMCA Certified Ratings Seal applies to air performance only.
Wheel Diameter = 18
1
⁄8 (460)
Shaft Diameter = 1 (25)
Outlet Area = 2.29 ft
2
(0.213 m
2
)
Mounting Hole Size = 1/2 (13)
^Approximate Unit Weight = 265 lb. (120 kg)
All dimensions in inches (millimeters)
For additional discharge positions see page 12
^Weight shown is largest cataloged Open Drip Proof motor
SFB-18 - Belt Drive
CFM OV
Static Pressure in Inches wg
0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5
2725 1188
RPM 364 464 550
BHP 0.29 0.44 0.60
Sones 8.4 9.2 10.2
3150 1374
RPM 388 481 563 635
BHP 0.39 0.56 0.74 0.93
Sones 10.3 10.1 11.2 12.6
3575 1559
RPM 415 500 578 648 712
BHP 0.52 0.70 0.90 1.11 1.33
Sones 11.1 11.3 12.2 13.4 15.5
4000 1744
RPM 444 524 596 662 725 782 836
BHP 0.68 0.89 1.10 1.32 1.56 1.80 2.03
Sones 12.0 13.1 13.1 14.0 15.8 17.7 19.5
4425 1930
RPM 473 548 615 680 738 795 848 898 943
BHP 0.87 1.09 1.32 1.57 1.81 2.08 2.34 2.60 2.86
Sones 13.6 14.7 14.0 14.4 15.9 17.8 19.7 21 23
4850 2115
RPM 503 573 638 698 756 809 861 910 957 1001
BHP 1.09 1.34 1.59 1.85 2.12 2.38 2.68 2.97 3.26 3.54
Sones 15.5 15.8 14.8 14.8 16.2 18.1 20 22 24 25
5275 2300
RPM 534 601 662 719 774 826 875 923 970 1013
BHP 1.36 1.63 1.90 2.17 2.46 2.75 3.04 3.35 3.67 3.99
Sones 17.7 17.1 15.6 15.6 16.7 18.7 20 22 24 26
5700 2486
RPM 566 630 687 743 793 844 893 938 982 1026
BHP 1.67 1.96 2.24 2.55 2.83 3.15 3.47 3.78 4.11 4.46
Sones 19.2 18.6 16.9 16.6 17.9 19.5 21 23 25 26
6125 2671
RPM 599 660 714 767 817 863 911 956 998 1039
BHP 2.03 2.34 2.64 2.96 3.28 3.58 3.94 4.28 4.61 4.95
Sones 20 20 18.5 18.0 19.4 21 22 24 26 27
6550 2857
RPM 631 689 743 791 840 886 929 974 1016
BHP 2.43 2.76 3.09 3.41 3.77 4.10 4.43 4.81 5.18
Sones 22 21 20 20 21 22 24 26 27
6975 3042
RPM 664 720 771 818 865 909 951 992 1034
BHP 2.88 3.23 3.60 3.93 4.30 4.67 5.02 5.38 5.78
Sones 24 23 23 22 23 24 26 27 29
D
o
n
o
t
s
e
l
e
c
t
t
o
th
e
l
e
f
t
o
f
t
h
i
s
s
y
s
t
e
m
c
u
r
v
e
cfm
30
7
⁄8
(784)
19
3
⁄8
(492)
1
1
⁄2
(38)
23
3
⁄8 (594)
25
1
⁄8 (638)
22
3
⁄8
(568)
42
(1067)
19
5
⁄8
(498)
13
3
⁄4
(349)
33
1
⁄4
(845)
22
(559)
17
3
⁄4
(451)
2
(51)
19
1
⁄4
(489)
18 (457)
35 (889)
36
7
⁄8 (937)
Maximum BHP at given RPM = (RPM/614)
3
(Maximum KW at a given RPM = (RPM/677)
3
)
Maximum RPM = 1050 and Minimum RPM = 310
Tip Speed (ft/min.) = RPM x 4.75
(Tip Speed (m/s) = RPM x 0.0241)
Maximum Motor Frame Size = 184T
SFB-18