Square Inline Mixed Flow Fans4
Typical Installation
NOTE: For units supplied or used with a Variable
Frequency Drive (VFD), reference the VFD
documentation for installation requirements, start-up
settings, parameter adjustments and trouble shooting.
VFDs provided by the manufacturer are factory
programmed for basic motor parameters, incoming
voltage parameters and maximum operating speed (Hz).
Follow NEC and local codes for VFD wiring and
installation. If the wire length between the VFD and
the controlled motor exceeds 100 ft (30.5 m), DV/DT
filters or VFD cabling may be required. Calculations and
proper application of DV/DT filters and VFD cabling is
by others; failing to do so may result in premature motor
failure.
Mounting Options
Mounting position allows fan to be installed for vertical
or horizontal airflow. In addition, the fan can be rotated
90 degrees either direction (access doors on the bottom
and top). Isolation is recommended.
IMPORTANT: Flex duct is recommended for
mounting to the inlet of the fan to allow for fitting
adjustments. If the inlet cone (venturi) requires
adjustment, it can be detached from the unit via
the fasteners located on the inlet panel.
IMPORTANT: The inlet and outlet duct should
have approximately three wheel diameters of
straight duct before and after the fan to achieve
cataloged performance.
3 WHEEL DIAMETERS 3 WHEEL DIAMETERS
FLEXIBLE DUCT
(BY OTHERS)
SIZE 7-16 (QTY 2)
SIZE 18-33 (QTY 4)
Square Duct Mounting Collars
Inlet and outlet square duct mounting collars are
provided for easy slip fit duct connection. Square
duct mounting collars are shipped separate for field
installation.
3 WHEEL DIAMETERS 3 WHEEL DIAMETERS
FLEXIBLE DUCT
(BY OTHERS)
SIZE 7-16 (QTY 2)
SIZE 18-33 (QTY 4)
1. Square duct adapter will come in 2 piece or 4 piece
designs per inlet/outlet depending on unit size .
See Side Discharge on page 5, Step 3 for details
on mounting left and right discharge square duct
mounting collars.
3 WHEEL DIAMETERS 3 WHEEL DIAMETERS
FLEXIBLE DUCT
(BY OTHERS)
SIZE 7-16 (QTY 2)
SIZE 18-33 (QTY 4)
• SQ-7 to SQ-16 will consist of 2 pieces per inlet/outlet
• SQ-18 to SQ-33 will consist of 4 pieces per inlet/outlet
2. Mount square duct adapter to inlet and/or outlet
using appropriate number of flange pieces and 5/16
inch semi-gimlet fasteners provided in hardware kit
(no nuts required).
3 WHEEL DIAMETERS 3 WHEEL DIAMETERS
FLEXIBLE DUCT
(BY OTHERS)
SIZE 7-16 (QTY 2)
SIZE 18-33 (QTY 4)
3. Repeat previous step for outlet of fan.
4. Tighten to 132 in·lbs (11 ft·lbs) 1/2 inch socket. Do
not over-tighten.
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