Heatilator • CST42A • 4012-012 Rev J • 08/06
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Figure 4.4 Locating the Outside Air Control
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
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.)
Factory-built
fireplace
Figure 4.3 Outside Combustion Air Placement
(Push slider to open.)
open
close
3 ft min. from top of
uppermost chimney
section to air inlet.
Attic insulation shield
may be used to keep
insulation away from
chimney.
Ceiling firestop
on floor of attic.
Figure 4.2 Outside Air Inlet Locations
