Owner’s Information
Page 37
Pub. No. 41-5016-12
Downflow/Horizontal furnaces are factory supplied with 2 stan-
dard size permanent 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 return air filter application, as
shown, features two 14" x 20" x 1" filter in the 17-1/2" wide furnace
cabinets; or two 16" x 20" x 1" filter in the 21" and 24-1/2" wide
furnace cabinets.
DOWNFLOW (Vertical) FILTER TABLE
REQUIRED FILTERS - SIDE **
CABINET WIDTH
FILTER QUANTITY & SIZE
17-1/2"
1 - 17" X 25" X 1"
21"
1 - 20" X 25" X 1"
24-1/2"
1 - 24" X 25" X 1"
** ON UPFLOW 5 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
REQUIRED FILTERS - DOWNFLOW
CABINET WIDTH
FILTER QUANTITY & SIZE
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"
DOWNFLOW FILTER
Airflow
DOWNFLOW/HORIZONTAL FILTER
Airflow
TYPICAL RETURN AIR FILTER INSTALLATION IN
UPFLOW MODEL IN HORIZONTAL POSITION
Airflow
UPFLOW (Vertical) FILTER TABLES
REQUIRED FILTERS - BOTTOM
CABINET WIDTH
FILTER QUANTITY & SIZE
17-1/2"
1 - 17" X 25" X 1"
21"
1 - 20" X 25" X 1"
24-1/2"
1 - 24" X 25" X 1"