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Form 43343110
-40- May 2021
15.0) AIR FOR COMBUSTION
If indoor combustion air is to be supplied for a tightly enclosed area, one square inch of free area opening shall
be provided below the heater for each 1,000 Btu/hr of heater input. When outside air is used, the opening below
the heater shall be one square inch of free area for each 4,000 Btu/hr of heater input. In contaminated
atmospheres or high humidity areas, optional outside air for combustion is recommended. Adequate clearances
around the air inlet screen must be maintained at all times. In larger open areas of buildings, infiltration normally
is adequate to provide air for combustion.
15.1) AIR FOR COMBUSTION -- HORIZONTAL THROUGH A SIDEWALL
Outside combustion air should be supplied directly to the heater when the building is subject to negative pressure,
or when contaminants or high humidity are present in the building air. These contaminants include paints,
solvents, corrosive vapors or any other foreign particles that may cause damage to the heater or result in poor
combustion.
Outside combustion air can be brought directly to the heater by a 4" diameter duct (field supplied) less than 20 ft.
long or equivalent. An approved vent cap an
d 4” flexible hose (suppl ied in accessory Kit #44129510) must be
connected to the duct as shown below. Connect the 4” flexible hose directly to the 4” starting col lar (supplied with
heater). This is used to allow for expansion/contraction of straight tube heaters.
The combustion air inlet should be not less than 3 ft. (0.9m), either vertically or horizontally, from the flue vent
termination. The air intake terminal must be located not less than 1 ft. (30cm) above grade. It is good installation
practice to supply combustion air from the same pressure zone as the vent outlet. Avoid bringing combustion air
to the heater from an attic space. There is no guarantee that adequate combustion air will be supplied.
Flexible Air Intake Hose: Insure that the Air Intake Hose connection is not too tight between the control box and
the Air Intake. The air intake hose can become disconnected as the heater expands and contracts during
operation.
Note: A cold air stopper is not used with fresh air intake through a sidewall.
All vent terminations and Combustion Air Intake
Terminations must be
at least 6” high er than
anticipated snow depth.