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Page 8 12426-4-0104
CLEARANCES
VENTILATION AND COMBUSTION AIR
LOCATION - ALL MODELS
ROUGH-IN INSTRUCTIONS
1. In selecting a location for installation, it is necessary to
provide adequate accessibility clearances for servicing and
proper installation.
2. Clearances to combustible surfaces are 4" (102mm) from
sides, 12" (305mm) to top, 1 1/2" (38mm) from ß oor.
NOTE: Minimum distance of 1 1/2" (38mm) must also be
maintained from top surface of carpeting, tile, etc.
Wall furnaces shall be installed in a location in which the facilities
for ventilation permit satisfactory combustion of gas and proper
venting under normal conditions. In buildings of conventional
frame, brick, or stone construction without tight storm windows
and doors, inÞ ltration is normally adequate to provide air for
combustion and draft hood dilution.
Where appliances are installed in conÞ ned and unconÞ ned spaces
within a building, the building being of unusually tight construction,
air for combustion and ventilation must be obtained directly from
outdoors or from such spaces that freely communicate with the
outdoors. Under these conditions, the conÞ ned and unconÞ ned
spaces shall be provided with two permanent openings, one near
the top of the enclosure and one near the bottom; each opening
shall have a free area of not less than one square inch (6.45cm
2
)
per 2,000 BTU (.6KW/H) per hour of total input.
Select a location near the center of the space to be heated. Overß ow
heat will circulate through doorways into adjacent rooms.
For large homes or spread-out ß oor plans, two or more furnaces are
recommended. Do not locate furnace where a door could swing
over the outer casing, or where circulation could be retarded by
furniture or cabinets.
Do not install in a closet, alcove or small hallway where the furnace
could be isolated by closing doors to the heated space.
When location is selected, check the walls, attic and roof to make
sure there are no obstructions such as pipes, electric wiring, etc.,
which would interfere with the installation of the furnace or vent
pipe.
NOTE: If Optional Blower is to be used, hard wiring must be
completed for the optional blower prior to installation
of header plate.
Provide an opening in the wall 14 1/2" (368mm) wide and 66
1/8" (168cm) high measured from top of ß oor plate (See Figure
2 and Figure 3). Wall depth is to be 2" x 4" framing with 1/4"
(6.5mm) to 5/8" (16mm) sheeting. Attach baseplate (not supplied
with furnace) to header plate with sheet metal screws at each end.
Attach 4" (102mm) oval, double wall vent pipe to baseplate. Attach
enough vent pipe so that when installed in wall opening the vent
pipe will extend above the ceiling plate by at least 6" (152mm).
Install ceiling spacers according to manufacturer's instructions.
Two header extensions are attached to the header plate. One header
extension is welded to the header plate and one header extension
is screwed to the header plate. To install header plate into wall
opening remove the header extension that is screwed to the header
plate (2 screws). Insert header plate with attached 4" oval, double
wall vent pipe into wall opening. Position header plate at height
shown in Figure 2. Locate rear edge of nailing ß ange at the back
of the 2" x 4" stud which will center the vent collar in the wall.
Locate the angled edge of header plate ß ush with the top of the
wall opening. Nail header plate to the wall studs. Replace and
attach header extension onto header plate with 2 screws.