Filter
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All installations and services must be performed by qualified service personnel.
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Connect the return air plenum to the filter rack and slide the filter into place. Dimensions for adapting the return air
plenum to the filter rack are provided (See Fig. 5).
Fig. 5: A typical filter rack and dimensions for the OH5-85DXE*** furnace.
PLEASE NOTE:
While scribing the return air opening, the filter rack can be held in position by tape or similar
temporary means.
Position the open end of the filter rack so as to provide access for filter replacement. Once the filter rack is
positioned correctly, scribe a line along the inside of the securing flange on three of the sides. To scribe a line on the
fourth side (the open end), use the open end support as a guide.
Remove the filter rack and cut the return air opening in the casing. Now the filter rack can be anchored to the
furnace with screws or pop-rivets through the securing flange of the filter rack.
cWARNING: When cutting openings in the casing DO NOT CUT ANY SUPPORTING
CLIPS OR ANGLES. Cut as close to the scribed line as possible, but do not cut the base clip or
blower pan support angle. (See Fig. 6).
Fig. 6: Cutaway view of fan section of a typical highboy furnace.
Connect the return air plenum to the filter rack and slide the filter into place. Dimensions for adapting the return air
plenum to the filter rack are provided on the bottom of the previous page.