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Duct Length: The inlet and outlet duct length should be
approximately two to three wheel diameters long before
and after the fan to achieve cataloged performance.
Side Discharge: Make sure discharge is orientated in
the same direction as originally ordered, performance
will change with different discharge positions. Refer to
Figure 6 for proper side discharge definition and the
Side Discharge chart for dimensions. Refer to the CAPS
program or consult factory for performance corrections.
Left Side
Discharge
Inlet
Figure 6
Pre-Start-Up Checks, Operation & Inspection
Pre Start-Up Checks
1. Check all fasteners for tightness. The wheel
should rotate freely and be aligned as shown in
Figure 7. Wheel position is preset and the unit is
tested at the factory. Movement may occur during
shipment, and realignment may be necessary.
Centering can be accomplished by loosening
the bolts holding the inlet (venturi) panel and
repositioning. Wheel and inlet cone overlap can be
adjusted by loosening the setscrews in the wheel
and moving the wheel to the desired position.
Wheel Overlap Dimensions
G
Figure 7
6
Centrifugal Inline Fans
Inline
Discharge
Height
Right Side
Width
Discharge
G - Overlap
Model
mm (in.)
(1/8)
SQ-M 70-90
3
(1/4)
SQ-M 100-160
6
(1/4)
BSQ-M 70-160
6
(3/8)
BSQ-M 180-240
10
(1/2)
BSQ-M 300-420
13
Side Discharge Duct Openings
Unit Size
SQ-M 70
SQ-M 80-90
BSQ-M 70-80-90
SQ-M 100/BSQ-M 100
SQ-M 120/BSQ-M 120
SQ-M 130/BSQ-M 130 (HP)
SQ-M 140/BSQ-M 140 (HP)
SQ-M 160/BSQ-M 160 (HP)
BSQ-M 180 (HP)
BSQ-M 200 (HP)
BSQ-M 240 (HP)
BSQ-M 300 (HP)
BSQ-M 360 (HP)
BSQ-M 420
All dimensions in millimeters (inches).
2. Wheel Rotation:
Direction of wheel
rotation is critical.
Reversed rotation
will result in poor air
performance, motor
overloading and
possible burnout.
Check wheel rotation
by momentarily
energizing the unit (all
SQ-M and BSQ-M
fans have clockwise wheel rotation when viewed
from top of fan). Rotation should be clockwise as
shown in Figure 8 and correspond to the rotation
decal on the unit.
WARNING
Correct direction of wheel rotation is critical. Reversed
rotation will result in poor air performance, motor
overloading and possible burnout.
3. Vibration Isolators: After fan is moved to desired
location, punch out the four knockout holes which
are located on the unit top and bottom panels.
Assemble the brackets to the unit according to the
appropriate drawings on page 5. Make certain all
connectors are tight and that all washers are in.
4. For BSQ-M Fans: If adjustments are made, it is
very important to check the pulleys for proper
alignment. Misaligned pulleys lead to excessive belt
wear, vibration, noise, and power loss (see Figure 9).
Width
Height
(9
⁄
)
(8
⁄
)
251
7
225
7
8
8
(12
⁄
)
(11
⁄
)
7
7
327
302
8
8
302 (11
⁄
)
7
(11
⁄
)
302
7
8
8
(13
⁄
)
(13
⁄
)
352
7
352
7
8
8
(15
⁄
)
(15
⁄
)
7
7
403
403
8
8
(17
⁄
)
(17
⁄
)
454
7
454
7
8
8
(19
⁄
)
(19
⁄
)
505
7
505
7
8
8
(22
⁄
)
(22
⁄
)
581
7
581
7
8
8
(23
⁄
)
(23
⁄
)
7
7
606
606
8
8
(27
⁄
)
(27
⁄
)
708
7
708
7
8
8
(28
⁄
)
(34
⁄
)
733
7
886
7
8
8
(31
⁄
)
(41
⁄
)
7
7
810
1064
8
8
(32
⁄
)
(37
⁄
)
835
7
962
7
8
8
(34
⁄
)
(43
⁄
)
886
7
1114
7
8
8
Figure 8
®
- Quick Links:
- Dimensional Data Sq-M/Bsq-M
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