American Standard Noncondensing Gas Furnaces - Manual (Page 17)

Pub. No. 32-5034-02 Page 5
Downflow Furnace Filters
Downflow/Horizontal furnaces use 2 standard size perma-
nent type air filters which may be located remote to the
furnace or in the return air duct. Check with your dealer
for the location of your filters.
A downflow/horizontal furnace vertical return air filter
application, as shown, features two 14" x 20" x 1" filter in
the 14-1/2" wide furnace cabinets; or two 16" x 20" x 1" filter
in the 17-1/2", 21", and 24-1/2" wide furnace cabinets.
A downflow/horizontal furnace with horizontal return air
filter application, as shown, features two 14" x 20" x 1"
filter in the 14-1/2" wide furnace cabinets; or two 16" x 20"
x 1" filter in the 17-1/2", 21", and 24-1/2" wide furnace
cabinets.
DOWNFLOW FILTER TABLE
REQUIRED FILTERS - DOWNFLOW
CABINET WIDTH FILTER QUANTITY & SIZE
14-1/2" 2 - 14" X 20" X 1"
17-1/2" 2 - 16" X 20" X 1"
21" 2 - 16" X 20" X 1"
24-1/2" 2 - 16" X 20" X 1"
FACTORY SUPPLIED UPFLOW FURNACE
RETURN AIR FILTERS
UPFLOW FURNACE RETURN AIR FILTERS
CABINET
WIDTH
QTY*
CABINET
BOTTOM FILTER
CABINET
SIDE FILTER
14-1/2" 1 14" X 25" X 1" 17-1/2" X 25" X 1"
17-1/2" 1 17" X 25" X 1" 17-1/2" X 25" X 1"
21" 1 20" X 25" X 1" 17-1/2" X 25" X 1"
24-1/2" 1 24" X 25" X 1" 17-1/2" X 25" X 1"
*NOTE - On 5 or 6 ton airflow models, if the airflow
requirement exceeds 1800 CFM, these models will require
filters on both sides; OR 1 side and the bottom; OR just the
bottom.
DOWNFLOW FILTER
DOWNFLOW/HORIZONTAL FILTER
WARNING:
Disconnect power to the
unit before removing the blower door. Failure to
follow this warning could result in property damage,
personal injury or death.