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Return Air Filters
TYPICAL AIR FILTER INSTALLATIONS
Filters are not factory supplied for modular blowers. Filter size needed
will be dependent on type of filter and CFM requirement. Filters must
be installed externally to the unit.
Important: It is recommended to transition return ducting to the
same size as the opening. It is acceptable for return duct
or filter frame to extend forward of the opening but
plastic plugs MUST be installed in any opening that the
duct or filter frame may cover.
Modular Blower Width
14–1/2"
17–1/2"
21"
24–1/2"
Note: For upflow airflow modular blowers where the airflow
requirement exceeds 1600 CFM - modular blowers will require
return air openings and filters on: (1) both sides, or (2) one
side and the bottom, or (3) just on the bottom.
Preparation for Upflow Bottom and Side Return Air Filter
Installations
All return air duct systems should provide for installation of return air
filters.
Important: Remove Blower Assembly and Panel Loop before cutting
cabinet to avoid cutting wires.
1.
Determine the appropriate position to set the modular blower in
order to connect to existing supply and return ductwork.
2.
For upflow side return installations, remove the insulation around
the opening in the blower compartment.
3.
The side panels of the upflow modular blower include locating
notches that are used as guides for cutting an opening for return
air, refer to the figure and the upflow modular blower outline
drawing for duct connection dimensions for various modular
blowers.
4.
If a 3/4" flange is to be used for attaching the air inlet duct, add to
cut where indicated by dotted lines. Cut corners diagonally and
bend outward to form flange.
5.
If flanges are not required, and a filter frame is installed, cut
between locating notches as in illustration.
6.
The bottom panel of the upflow modular blower must be removed
for bottom return air.
UPFLOW MODULAR BLOWERS ONLY
*
LOCATING
NOTCHES
PROVIDED
*
FOR SIDE
RETURN
CUTOUT
*
* SEE OUTLINE DRAWING
P0V0-SVX001-1A-EN
Filter
Qty and Size
1 — 14" x 25" x 1"
1 — 16" x 25" x 1"
1 — 20" x 25" x 1"
1 — 24" x 25" x 1"
*
FRONT OF
MODULAR BLOWER
RETURN AIR FILTERS FOR MODULAR BLOWER IN
HORIZONTAL CONFIGURATION
When the modular blower is installed in the horizontal configuration,
the return air filters must be installed exterior to the modular blower
cabinet. Remote filter grilles may be used for homeowner
convenience, refer to
Figure 1, p. 21
the duct work upstream of the modular blower, refer to
Figure 2, p.
21.
Filter kits are available for horizontal applications.
Direct coupled side returns are not allowed to the blower
cabinet.
Figure 1. Remote Filter Installation
Figure 2. Duct Filter Installation
G G e e n n e e r r a a l l I I n n s s t t a a l l l l a a t t i i o o n n
or the filters may be installed in
21
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