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Figure 43: Fan Wheel Rotation
Table 9: Wheel to Inlet Funnel Relationship—
Direct-Drive Class II Fans
Fan Size
18
20
22
24
27
30
33
36
40
44
Table 10: Wheel to Inlet Funnel Relationship—
Direct Drive Class III Fans
Fan Size
18
20
22
24
27
30
33
36
40
44
49
54
60
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Table 11: Setscrew Torque Specifications—
Class II Plenum Fans Only
Overlap (in .)
0.38
0.41
0.45
0.50
0.55
0.61
0.67
0.75
0.82
0.91
Overlap (in .)
0.31
Table 12: Bearing Collar and Wheel Hub Set Screw Torque
0.38
(all fans except Class II plenum fans)
0.44
0.50
0.55
0.62
0.75
0.81
0.88
0.94
1.0
1.06
1.12
27
Fan Size
Setscrew Size
18
3/8
20
3/8
22
3/8
24
3/8
27
3/8
30
1/2
33
1/2
36
1/2
40
1/2
44
1/2
49
1/2
54
1/2
60
3/4
Set Screw Diameter
(in)
1/16
1/4
3/8
7/16
1/2
5/8
IM 915-13 • VISION - EXTENDED SIZES
Operation Guidelines
Torque (ft .-lb)
Aluminum
Steel
19.2
N/A
19.2
N/A
19.2
N/A
19.2
N/A
19.2
22
41.7
55
41.7
55
41.7
55
41.7
55
41.7
55
41.7
55
41.7
55
115
150
Minimum torque
ft/lbs (kg/m)
5.5 (0.76)
10.5 (1.45)
19.0 (2.63)
29.0 (4.01)
42.0 (5.81)
92.0 (12.72)
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