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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.
Roof Mounting
12 in. Minimum
Curb Height
Recommended
Duct/Damper
Size
Recommended
Roof Opening
Recommended
Fan Size
Duct/Damper Size
7
9-1/2 x 6-3/4
9
11-1/2 x 10-1/2
12
15 x 13-1/2
15
19-1/2 x 17-1/4
16
20-1/2 x 19-1/4
18
21-1/2 x 22
20
24-1/4 x 24-1/4
22
27 x 27-1/4
24
30-1/2 x 30-1/2
27
33-3/4 x 33-3/4
30
36-1/2 x 36-1/2
33
40-1/2 x 40-1/2
All dimensions in inches.
STEP 1 - Roof Opening (bottom discharge units only)
• Cut an appropriately sized hole in the roof surface.
STEP 2 - Install Roof Curb
• Position curb on the roof and install curb per
manufacturer's instructions. Caulk and flash
curb to ensure a water tight seal.
®
STEP 3 - Install Ductwork (bottom discharge
units only)
• Good duct practices should be followed in
Wiring by others to
STEP 4 - Apply Sealant
optional disconnect
• Before installing supply unit, apply a sealant around
0.75 in.
STEP 5 - Install Unit
• Use a crane and set of spreader bars hooked to the
Recommended
Roof Opening
13-1/4 x 10-1/2
15-1/4 x 14-1/4
STEP 6 - Assemble Filter Tracks x2
18-1/4 x 17-1/4
NOTE: Horizontal intake sizes 7-24 and bottom intake
23-1/4 x 21
sizes 7-22 ship with the hood installed. For units with
24-1/4 x 23
the hood already installed, skip to Step 10 for ductwork
installation instructions.
25-1/4 x 25-1/4
28 x 28
• Retrieve ship loose intake hood/cover package and
31-1/4 x 31-1/4
34-1/4 x 34-1/4
• Align the holes on the top and bottom filter tracks and
37-1/2 x 37-1/2
41-3/4 x 41-3/4
46 x 46
accordance with SMACNA and AMCA guidelines,
NFPA 96 and any local codes. The discharge should
have approximately three duct diameters of straight
duct to achieve cataloged performance (see table
below). The ductwork should extend far enough
above the roofline to meet the supply unit once it is
installed. A duct adapter is recommended for bottom
discharge to align ductwork with the unit. The duct
adapter is only a guide and is not to be used as a
support for the ductwork. Fans may be configured
with a damper, and the ductwork may not be able to
run up to the bottom of the supply unit. In this case,
mount the ductwork beneath the damper.
the perimeter of the supply duct to isolate the fan
and minimize vibration.
isolator holes on the top of the unit to lift and center
the unit on the curb in the correct orientation. Use
self-tapping sheet metal screws to fasten unit to the
curb through provided holes. Electrical connections
can be made at this time.
NOTE: Always use all four lifting holes when using
a sling.
prepare parts to be installed on the fan
install a spring nut over the two overlapping holes.
Depending on the fan configuration the filter tracks
may utilize a different design than shown.
Bottom track
Rooftop Supply Mixed Flow Fans
Ductwork with duct
adapter installed
Sealant
Spring nuts
Top
track
5
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