Forsideconnectionsusinga16"x25"filter,cutouttheem-
bossedareashowninFigure31. This wil! provide a 141/2"
x 221/2 " approximate opening.
Side Return Air Cutout
A = 141/2" Height of Cutout for 16" x 25" Filter
B = 221/2" Width of Cutout for 16" x 25" Filter
B
Embossed Area
on Side of Furnace
Furnace
Bottom
NOTE: Furnaces with 5 TONS cooling rating require two(2) side
returns or one side return with bottom return.
2. Bottom returns can be made by removing the knockout
panel in the furnace base. Do NOT remove knock-out ex-
cept for a bottom return.
3. Installation of locking-type dampers are recommended in
all branches, or in individual ducts to balance system's air
flow.
4. Non-combustible, flexible duct connectors are recom-
mended for return and supply connections to furnace.
5. If air return grille is located close to the fan inlet, install at
least one, 90 ° air turn between fan and inlet grille to reduce
noise.
NOTE: To further reduce noise, install acoustical air turning
vanes and/or line the inside of duct with acoustical material.
Sizing
Existing or new ductwork MUST be sized to handle the correct
amount of airflow for either heating only or heating and air condi-
tioning.
Insulation
1. Insulate ductwork installed in attics or other areas exposed
to outside temperatures with a minimum of 2" insulation
and vapor barrier.
2. Insulate ductwork in indoor unconditioned areas with a
minimum of 1" insulation with indoor type vapor barrier.
Filters
A Filter must be used:
Filters are not supplied with these furnaces, but can be purchased
from dealer.
Use either filter type:
• Washable, high velocity filters are based on a maximum
air flow rating of 600 FPM.
• Disposable, Iowvelocity filters are based on a maximum
air flow of 300 FPM when used with filter grille.
NOTE: Disposable, low velocity filters may be replaced with
washable, high velocity filter providing they meet the minimum
size areas. Washable, high velocity filters can be replaced ONLY
with same type and size.
Side Mounted Filter Rack
°I / jJ
25-20-90
FilterInstallation using Optional Filter Rack
When installing or removing a bottom mounted filter, slide the two
side filter clips to the back of the furnace BEFORE installing or re-
moving. This will allow the filter to clear the front raised edge of the
furnace. Insert filter into side clips first and push filter back until it is
fully engaged into back clip. When filter is in place, slide clips back
into place midway on filter as shown in Figure 33.
Bottom Mounted Filter Rack
AW3192
Slide filter clips towards back before removing
Refer to Figure 34 and for guidelines to install filters. Furnaces
which require larger filter media and have limited clearances on
one side of furnace, require a standoff filter rack, see Figure 34,
available from your distributor.
[_ 440 01 101004
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