Wheel Rotation
Rotation direction of the wheel is critical and incorrect
rotation will result in reduced air performance,
increased motor loading and possible motor burnout.
Check wheel rotation by momentarily energizing the
unit and noting if rotation is in the same direction as
the airflow at the outlet and conforms to the rotation
decal affixed to the unit.
Approximate Wheel Clearance Dimensions
Unit Size
SWB SFD SFB
SFD SFB
SWB
Series
100
SWB
Series
200
SWB
Series
300
Overlap
Overlap
Tolerance
Radial
Gap
Gap Gap
inches (mm)
6 106 206
3
8
(10)
7.5 107 207
3
8
(10)
9 9 108 208
1
2
(13)
1
2
(13)
10 10 110 210
3
8
(10)
1
4
(6)
5
32
(4)
1
2
(13)
1
2
(13)
12 212
3
8
(10)
1
4
(6)
5
32
(4)
1
2
(13)
113 213
7
16
(11)
1
4
(6)
5
32
(4)
1
2
(13)
15 115 215
1
2
(13)
1
4
(6)
5
32
(4)
1
2
(13)
116 216
1
2
(13)
1
4
(6)
5
32
(4)
18 118 218
5
8
(16)
3
8
(10)
5
32
(4)
1
2
(13)
20 120 220
5
8
(16)
3
8
(10)
5
32
(4)
5
8
(16)
22 222
11
16
(18)
3
8
(10)
5
32
(4)
5
8
(16)
124 224
3
4
(19)
3
8
(10)
5
32
(4)
25
3
4
(19)
27 327
7
8
(22)
1
4
(6)
3
16
(5)
3
4
(19)
30 330
15
16
(24)
3
8
(10)
3
16
(5)
3
4
(19)
333 1
1
16
(27)
3
8
(10)
3
16
(5)
336 1
3
16
(30)
3
8
(10)
3
16
(5)
340 1
1
4
(32)
3
8
(10)
1
4
(6)
344 1
7
16
(37)
3
8
(10)
5
16
(8)
349 1
9
16
(40)
1
2
(13)
5
16
(8)
On belt drive units, centering can be accomplished
by (a) loosening the inlet cone bolts to move the inlet
cone or by (b) loosening the bearings in order to
move the shaft. Wheel and inlet cone overlap can be
adjusted by loosening the wheel hub set screws and
moving the wheel to the desired position. Tighten all
fasteners and set screws securely and realign drive
pulleys after adjustment.
NOTE
Models SFD and SFB units should be operated only
when attached to the system for which they were
designed. Without proper system static pressure,
the motor could be overloaded.
Wheels as viewed from the drive side:
Airfoil
Forward Curved
Backward Inclined
R
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R
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R
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R
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Backward Inclined
Forward Curved
Airflow
Airflow
Backward Inclined Forward Curved
Airflow
Airflow
These are the original drawings on the Illustrator file
when I opened it. The IOM had the wheel layered on
top of the scroll.
I will incorporate the
wheel on the scroll
without creating
an additional
layer in the
InDesign file.
April 19, 2011
I positioned the wheels onto the scroll outline. The forward curved wheel was mirrored and
positioned on the scroll above. This is how was done in the InDesign Utility Fans IOM file.
The wheel was laid on top of the scroll within the InDesign file. Better to do this within Illustrator.
barb w
R
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t
a
t
i
o
n
R
o
t
a
t
i
o
n
Airflow
Airfoil
R
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t
a
t
i
o
n
R
o
t
a
t
i
o
n
R
o
ta
t
io
n
R
o
ta
t
io
n
Backward Inclined
Forward Curved
Airflow
Airflow
Backward Inclined Forward Curved
Airflow
Airflow
These are the original drawings on the Illustrator file
when I opened it. The IOM had the wheel layered on
top of the scroll.
I will incorporate the
wheel on the scroll
without creating
an additional
layer in the
InDesign file.
April 19, 2011
I positioned the wheels onto the scroll outline. The forward curved wheel was mirrored and
positioned on the scroll above. This is how was done in the InDesign Utility Fans IOM file.
The wheel was laid on top of the scroll within the InDesign file. Better to do this within Illustrator.
barb w
R
o
t
a
t
i
o
n
R
o
t
a
t
i
o
n
Airflow
Airfoil
R
o
t
a
t
i
o
n
R
o
t
a
t
i
o
n
R
o
ta
t
io
n
R
o
ta
t
io
n
Backward Inclined
Forward Curved
Airflow
Airflow
Backward Inclined Forward Curved
Airflow
Airflow
These are the original drawings on the Illustrator file
when I opened it. The IOM had the wheel layered on
top of the scroll.
I will incorporate the
wheel on the scroll
without creating
an additional
layer in the
InDesign file.
April 19, 2011
I positioned the wheels onto the scroll outline. The forward curved wheel was mirrored and
positioned on the scroll above. This is how was done in the InDesign Utility Fans IOM file.
The wheel was laid on top of the scroll within the InDesign file. Better to do this within Illustrator.
barb w
R
o
t
a
t
i
o
n
R
o
t
a
t
i
o
n
Airflow
Airfoil
5
Centrifugal Utility Fans
®