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A
PLENUM
OPENING
B
OPENING
C
Fig. 11 - - Floor and Plenum Opening Dimensions
Roll- -Out Protection
Provide a minimum 17- -3/4- -in. X 22- -in. (451 X 559 mm) piece
of sheet metal for flame roll- -out protection in front of burner area
for furnaces closer than 12- -in. (305 mm) above the combustible
deck or suspended furnaces closer than 12- -in. (305 mm) to joists.
The sheet metal MUST extend underneath the furnace casing by
1- -in. (25 mm)with the door removed.
The bottom closure panel on furnaces of widths 17- -1/2- -in. (445
mm) and larger may be used for flame roll- -out protection when
bottom of furnace is used for return air connection. See Fig. 17
for proper orientation of roll- -out shield.
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed in
bottom return- -air opening. Remove and discard this panel when
bottom return air is used. To remove bottom closure panel,
perform the following:
1. Tilt or raise furnace and remove two screws holding bot-
tom filler panel. (See Fig. 9.)
2. Rotate bottom filler panel downward to release holding
tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed in
bottom return- -air opening. This panel MUST be in place when
side return air inlet(s) are used without a bottom return air inlet.
Not all horizontal furnaces are approved for side return air
connections (See Fig. 20.)
D
FLOOR
A96283
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
DOWNFLOW
SUBBASE
SHEET METAL
Fig. 12 - - Furnace, Plenum, and Subbase Installed on a
Combustible Floor
FURNACE
APPROVED
COIL ASSEMBLY
COIL BOX
COMBUSTIBLE
FLOORING
SHEET METAL
PLENUM
OPENING
Fig. 13 - - Furnace, Plenum, and Coil Assembly or Coil Box
Installed on a Combustible Floor
12
FURNACE
PLENUM
FLOOR
OPENING
OR
FLOOR
A96285
A08556
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