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6.3 Combustion Air Intake Requirements
There are 2 methods of supplying the heater with combustion air. They are as follows:
1. Room Air: Conventional homes may use room air for combustion. Where
room air is used, the exhaust pipe must incorporates a minimum 3’
vertical section immediately adjoining the heater. It is highly recom-
mended that the total exhaust vertical rise be longer than the total
horizontal run and that the majority of the vertical rise be as close to the
heater as possible..
2. Outside Air: All installations can be connected to the exterior of the
building using a noncombustible metal pipe, with a minimum 2 inch
(50mm) internal diameter or by using APR Part No: AK100 (Air Intake
Kit). A larger diameter air intake pipe may be required if the length of
intake exceeds 3’ (1 meter) or has several bends. Use of plastic pipes are
not permitted.
In some installations, outdoor combustion air may be needed to ensure proper perfor-
mance. If your heater burns poorly, experiences roll-out or back-drafts, outside combus-
tion air may be required.
The following restrictions apply to any and all installations:
1. Use of plastic pipes is not permitted under any circumstance.
2. The combustion air intake must terminate into a vented space, i.e. outside,
vented attic, vented crawl space. This heater cannot draw air from a
closed space such as a closed garage, airtight crawl space or any other
sealed room.
3. The elevation of the combustion air intake must be below the exhaust
vent. An elbow may be used to lower the air intake point below that of
the exhaust vent.
4. Excessive lengths and elbows on the air intake pipe will cause airflow
restrictions. A minimum of 2 inch (50 mm) or larger venting should be
used for lengths exceeding 3’ (1 meter). Increase the venting size as
needed.
5. When installing a KOZI KSH 120 in a garage/work shop, the combustion
air must be taken from the outside or else the unit must be elevated a
minimum of 15 inches above floor level if inside combustion air is
desired.
INSTALL ALL VENTING AT CLEARANCES
SPECIFIED BY THE VENT MANUFACTURER
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