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Outlet placed
higher than 3 ft
below the
termination cap
Attic space
Garage or
combustible
liquids storage
Outlet blocked by
snow, leaves, etc.
Clear area
outside
house or in
ventilated
crawl space
YES
NO
NO
NO
NO
Factory-built
fireplace
Use only duct materials specified by manufacturer (preferably
with short run or mainly straight duct, except small dip for cold
air trap which will help prevent flow of cold air).
Figure 7.4 Outside Combustion Air Placement
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3 ft min. from
top of uppermost
chimney section
to air inlet.
Heatilator • CL36D, CR36D • 12538 • Rev V • 05/09
Figure 7.3 Possible Outside Air Inlet Locations
Note: Chimney air kit not
shown, but required in
Canada.