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Installer's
Guide
INSTALLING
THE FILTER
The optional
filter
may
need
to be cut to fit the
unit
depend-
ing on the location
of the return
air filter.
A score line and the words "CUT HERE"
are located on the
end of the filter. If your application
requires
cutting
the filter,
do so as indicted
by the score mark.
UNIT
SIZE
17-1/2"
21"
24-1/2"
RETURN AIR
BOTTOM
SIDE
DO NOT CUT
DO NOT CUT
DO NOT CUT
CUT ON LINE
DO NOT CUT
CUT ON LINE
TYPICAL DOWNFLOWFURNACE
RETURNAIR FILTER INSTALLATIONS
Two high velocity type air filters are required lot for each
downflow furnace. Downflow furnace filters must be located
outside the furnace cabinet. Typical installations are shown
in Figure 23. Tables 5 and 6 provide inlormation lot installa-
tion of the filter retaining brackets shipped with downflow
furnaces.
TABLE 4
MODELS
CABINET
FILTER
NUMBERS
WIDTH
QTY & SIZE
*DX1B040A9241A
*DX1B060A9361A
17-1/2"
2- 14"X20"X
1"
*DX1B080A9421A
*DX1C100A9481A
21"
2 - 16" X 20" X 1"
*DX1D120A9601A
24-1/2"
2- 16"X20"X
1"
*First letter may be "A" or "T"
TABLE 5
LOCATING FILTER RETAINER BRACKETS IN DUCTWORK
CABINET
RETURN
DIMENSION DIMENSION
FILTER
DUCT
BRACKET
WIDTH
WIDTH
"A ....
B"
LOCATION*
17-1/2"
16-1/4"
15"
14"
14-3/8"
21"
19-3/4"
19-1/2"
14"
13-1/8"
24-1/2"
23-1/4"
22"
14"
13-5/8"
* LOCATION
DIMENSION
IS FROM
END
OF
DUCT
AGAINST
THE
FURNACE
TO
THE
SCREW
HOLES
FOR
THE
BRACKET.
O
DOWNFLOW
Airflow
f_P"
HORIZONTAL
TABLE 6
MINIMUM CLEARANCE
FROM COMBUSTIBLE
MATERIALS FOR
UPFLOW/HORIZONTAL
AND DOWNFLOW/HORIZONTAL
FURNACES
UNIT LOCATION
VERTICAL
HORIZONTAL
HORIZONTAL
FURNACE SURFACE
CLOSET
CLOSET
ALCOVE / ATTIC
SIDES
0"
1"
0"
BACK
0"
3"
6"
TOP
1"
1"
1"
FRONT
3"
3"
18"
VENT
0"
0"
0"
NOTE: CLEARANCE
REQUIRED AT TOP OF PLENUM IS 1"
12
18-CD19D6-27
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