Universal Single Width Fans
12
Wheels must rotate freely and not rub on the inlet
cone. Model XUEF with BI (backward-inclined) or
AF (airfoil) wheels overlap the inlet cone.
There is a gap between the inlet cone and
wheel on model XUEF with FC (forward-
curved) wheels. Refer to the tables for the
proper dimension.
Radial Gap and Alignment
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 when the
unit has been disassembled.
Radial Gap:
Adjust inlet cone position such
that the radial gap between the wheel cone
and inlet cone is evenly distributed around
the wheel.
Radial gap is adjusted by loosening the inlet
cone/ring bolts and centering the cone/
ring 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:
Overlap 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.
Method for Centering Wheel:
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.
Radial Gap, Overlap and Wheel Alignment
Wheel
Cone
Radial
Gap
Radial
Gap
Overlap
A
Straight
Edge
Straight
Edge
Wheel
Cone
Wheel
Cone
Inlet
Cone
Inlet
Cone
Inlet
Cone
Inlet
Cone
Backward-Inclined
Radial Gap and Overlap Dimensions
Series 100
Direct Drive
A
Overlap
Overlap
Tolerance
Size
inches (mm)
4
4
3
⁄
4
(121)
1
⁄
8
(3)
1
⁄
16
(2)
6
4
3
⁄
4
(121)
1
⁄
8
(3)
1
⁄
16
(2)
8
4
3
⁄
4
(121)
1
⁄
8
(3)
1
⁄
16
(2)
10
5
11
⁄
16
(145)
1
⁄
8
(3)
1
⁄
8
(3)
13
5
7
⁄
8
(150)
1
⁄
8
(3)
1
⁄
8
(3)
15
7
(178)
3
⁄
8
(10)
1
⁄
8
(3)
16
7
1
⁄
2
(191)
1
⁄
8
(3)
1
⁄
8
(3)
18
9
(229)
1
⁄
4
(6)
1
⁄
8
(3)
Belt Drive
A
Overlap
Overlap
Tolerance
Size
inches (mm)
4
4
3
⁄
4
(121)
1
⁄
8
(3)
1
⁄
16
(2)
6
4
3
⁄
4
(121)
1
⁄
8
(3)
1
⁄
16
(2)
8
4
3
⁄
4
(121)
1
⁄
8
(3)
1
⁄
16
(2)
10
4
3
⁄
4
(121)
1
⁄
8
(3)
1
⁄
16
(2)
13
5
3
⁄
4
(146)
1
⁄
4
(6)
1
⁄
8
(3)
15
6
1
⁄
2
(165)
1
⁄
2
(13)
3
⁄
16
(5)
16
7
1
⁄
8
(181)
1
⁄
2
(13)
3
⁄
16
(5)
18
8
5
⁄
8
(219)
5
⁄
8
(16)
1
⁄
4
(6)
20
7
3
⁄
4
(197)
5
⁄
8
(16)
1
⁄
4
(6)
24
10
3
⁄
16
(259)
3
⁄
4
(19)
3
⁄
8
(10)
Radial Gap and Overlap Dimensions
Series
A
Overlap
Overlap
Tolerance
300
500
inches (mm)
6
2
3
⁄
4
(70)
3
⁄
8
(10)
1
⁄
8
(3)
7
5
(127)
3
⁄
8
(10)
1
⁄
8
(3)
8
3
1
⁄
8
(79)
3
⁄
8
(10)
1
⁄
8
(3)
10
5
(127)
3
⁄
8
(10)
1
⁄
8
(3)
7
1
1
⁄
8
(29)
2
7
⁄
8
(73)
1
⁄
8
(3)
8
3
1
⁄
8
(79)
7
⁄
8
(22)
1
⁄
8
(3)
9
3
3
⁄
8
(86)
5
⁄
8
(16)
1
⁄
8
(3)
10
3
3
⁄
4
(95)
7
⁄
32
(6)
1
⁄
8
(3)
12
12
4
1
⁄
4
(108)
11
⁄
32
(9)
1
⁄
8
(3)
13
13
4
11
⁄
16
(119)
3
⁄
8
(10)
1
⁄
8
(3)
15
15
5
3
⁄
16
(132)
7
⁄
16
(11)
1
⁄
8
(3)
16
16
5
3
⁄
4
(146)
7
⁄
16
(11)
1
⁄
8
(3)
18
18
6
3
⁄
8
(162)
15
⁄
32
(12)
1
⁄
8
(3)
20
20
7
(178)
1
⁄
2
(13)
3
⁄
16
(5)
22
22
7
13
⁄
16
(198)
17
⁄
32
(13)
3
⁄
16
(5)
24
24
8
5
⁄
8
(219)
9
⁄
16
(14)
1
⁄
4
(6)
27
27
9
7
⁄
16
(240)
11
⁄
16
(17)
1
⁄
4
(6)
30
30
10
9
⁄
16
(268)
11
⁄
16
(17)
3
⁄
8
(10)
33
33
11
7
⁄
16
(291)
15
⁄
16
(24)
3
⁄
8
(10)
36
36
12
3
⁄
4
(324)
15
⁄
16
(24)
3
⁄
8
(10)
40
40
14
3
⁄
16
(360)
29
⁄
32
(23)
3
⁄
8
(10)
44
44
15
9
⁄
16
(395)
1
1
⁄
8
(29)
3
⁄
8
(10)
49
49
17
1
⁄
8
(435)
1
1
⁄
4
(32)
1
⁄
2
(13)
54
18
13
⁄
16
(478)
1
17
⁄
32
(39)
1
⁄
2
(13)
60
20
15
⁄
16
(532)
1
9
⁄
16
(40)
1
⁄
2
(13)
66
22
7
⁄
8
(581)
1
29
⁄
32
(48)
1
⁄
2
(13)
73
25
1
⁄
2
(648)
1
29
⁄
32
(48)
1
⁄
2
(13)
Gap Size
Wheel
Forward-Curved
Inlet
Cone
Gap Dimensions
Series 100
Size
Gap
Direct Drive
6
3
⁄
8
(10)
7
3
⁄
8
(10)
9
1
⁄
2
(13)
10
1
⁄
2
(13)
Belt Drive
9
1
⁄
4
(6)
10
1
⁄
4
(6)
12
1
⁄
4
(6)
15
1
⁄
4
(6)
18
1
⁄
4
(6)
20
1
⁄
4
(6)
22
1
⁄
4
(6)
24
1
⁄
4
(6)
