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Operating Instructions
Upflow/Horizontal Furnace Filters
The Upflow/Horizontal furnace when installed horizontally re-
quires 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 appli-
cation, 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.
UPFLOW/HORIZONTAL WITH FILTER KIT
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 (Vertical) FILTER TABLES
REQUIRED FILTERS - BOTTOM
CABINET WIDTH
17-1/2"
21"
24-1/2"
REQUIRED FILTERS - SIDE **
CABINET WIDTH
17-1/2"
21"
24-1/2"
** 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
Page 22
FILTER QUANTITY & SIZE
1 - 17" X 25" X 1"
1 - 20" X 25" X 1"
1 - 24" X 25" X 1"
FILTER QUANTITY & SIZE
1 - 17" X 25" X 1"
1 - 20" X 25" X 1"
1 - 24" X 25" X 1"
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.
DOWNFLOW FILTER
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/HORIZONTAL FILTER
DOWNFLOW (Vertical) FILTER TABLE
REQUIRED FILTERS - SIDE **
CABINET WIDTH
17-1/2"
21"
24-1/2"
** 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
FILTER QUANTITY & SIZE
1 - 17" X 25" X 1"
1 - 20" X 25" X 1"
1 - 24" X 25" X 1"
Pub. No. 41-5010-20
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