Operating instructions

32-5027-11 5
User’s Information
DOWNFLOW FILTER
Airflow
Upflow / Horizontal Furnace Filters
The Upflow/Horizontal furnace when installed horizontally
requires a horizontal filter kit. The filters may be located
remote to the furnace or in the return air duct near the furnace.
Check with your dealer for the location of your filters.
An upflow/horizontal furnace in horizontal return air filter
application, as shown, features two 16" x 20" x 1" filters in
the 17-1/2", 21" and 24-1/2" wide furnace cabinets.
To replace filters, remove the filter access door, lift the filter
from the lower bracket and shift the filter to the side to free
the top filter from the bracket and slide the filters out
through the filter access door. After cleaning, replace the
filters in the same manner making sure that the filters are
secured in place in both top and bottom filter brackets.
Replace filter access door.
Air filters may also be located outside of the furnace using a
remote filter grille. The filter grille could be in a hallway,
wall, or in the ceiling. Check with your dealer for the exact
location of your filter and the method of changing the filters.
UPFLOW FILTER TABLES
REQUIRED FILTERS - BOTTOM
CABINET WIDTH FILTER QUANTITY & SIZE
14-1/2" 1 - 14" X 25" X 1"
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"
REQUIRED FILTERS - SIDE **
CABINET WIDTH FILTER QUANTITY & SIZE
14-1/2" 1 - 17" X 25" X 1"
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"
** ALL 5 TON AIRFLOW MODELS ("960", "961", OR "972"),
REQUIRE
BOTH SIDES OR 1 SIDE AND THE BOTTOM,
OR
JUST THE BOTTOM FOR SUFFICIENT AIRFLOW
Downflow/Horizontal furnaces are factory supplied with
2 standard 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" filters in the 17-1/2"
wide furnace cabinets; or two 16" x 20" x 1" filters in the 21"
and 24-1/2" wide furnace cabinets.
DOWNFLOW FILTER TABLE
UPFLOW/HORIZONTAL WITH FILTER KIT
Airflow
DOWNFLOW/HORIZONTAL FILTER
Airflow
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"