Centrifugal, Industrial and Filtered Supply
8
Radial Gap, Overlap and Wheel Alignment
Unit
Size
BIDW, AFDW, LSF
Inlet Cone to Backplate
Dimension
± Tolerance (in.)
Dimension
± Tolerance (
mm
)
12
4.00
± 1/8
102
± 3
13
4.44
± 1/8
113
± 3
15
5.00
± 1/8
127
± 3
16
5.44
± 1/8
138
± 3
18
6.38
± 1/8
162
± 3
20
7.00
± 3/16
178
± 5
22
7.81
± 3/16
198
± 5
24
8.63
± 1/4
219
± 6
27
9.44
± 1/4
240
± 6
30
10.56
± 3/8
268
± 10
33
11.44
± 3/8
291
± 10
36
12.75
± 3/8
324
± 10
40
14.19
± 3/8
360
± 10
44
15.56
± 3/8
395
± 10
49
17.13
± 1/2
435
± 13
54
18.81
± 1/2
478
± 13
60
20.94
± 1/2
532
± 13
66
22.88
± 1/2
581
± 13
73
25.50
± 1/2
648
± 13
Efficient fan performance can be maintained by having
the correct radial gap, overlap and wheel alignment.
These items should be checked after the fan has been
in operation for 24 hours and before start-up after
the unit has been serviced. Radial gap and overlap
information applies to models: BIDW, AFDW, LSF and
IP with air handling wheel.
Radial Gap
is adjusted
by loosening the inlet
cone bolts and centering
the cone on the wheel.
If additional adjustment
is required to maintain
a constant radial gap,
loosening the bearing
bolts and centering the
wheel is acceptable as a
secondary option.
Overlap or offset
, is
adjusted by loosening
the wheel hub from the
shaft and moving the
wheel to the desired
position along the
shaft.
The transition between
the inlet cone and
wheel should be as
shown; there is a
smooth feel to the
profile when moving
from one component
to the other. Overlap
on double width fans
is set by having equal
spacing on each side of
the wheel.
Correct
wheel
alignment
for an
industrial process
fan (open radial or
backplated/wool
wheel) is achieved by
centering the wheel in
the housing.
Overlap
Overlap
Radial
Gap
BIDW, AFDW, LSF
Radial
Gap
Overlap
A
Inlet
Cone
Wheel
IP (Air Handling)
Equal Spacing
Housing
Wheel
Wheel Alignment
IP (Open Radial or Backplated)
Unit
Size
IP (Air Handling)
Inlet Cone to Backplate
A Dimension
± Tolerance (in.)
Dimension
± Tolerance (
mm
)
5
3.67
± 1/8
93
± 3
7
5.36
± 1/8
136
± 3
9
6.88
± 1/8
175
± 3
11
8.38
± 1/4
213
± 6
13
9.92
± 1/4
252
± 6
15
11.39
± 3/8
289
± 10
17
12.95
± 3/8
329
± 10
19
14.48
± 3/8
368
± 10
21
15.95
± 3/8
405
± 10
23
17.50
± 1/2
445
± 13
26
20.00
± 1/2
508
± 13
29
22.31
± 1/2
567
± 13
33
25.75
± 1/2
654
± 13
37
28.82
± 1/2
732
± 13
41
31.38
± 1/2
797
± 13
Centrifugal
Backward Inclined
Centrifugal
Airfoil
Industrial Process
Radial Blade
Always viewed from the drive side.
Clockwise Rotation
