24
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 7.18 Outside Combustion Air Placement
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3 ft min. from

top of uppermost

chimney section

to air inlet.

G. Install Outside Air Kits
• Refer to Figures 7.17 through 7.21.
• Keep duct runs short and straight to minimize
restriction. A small dip is acceptable for a cold air
trap.
• The outside air kit must be installed on both sides of
the fi replace.
• Locate the outside air hoods in a clear area, preferably
into prevailing wind during the heating season. Refer
to Figure 5.2 and Figure 7.18.
• The air duct may be run vertically.
- The outside air hood must be at least 3 ft (.91 m)
below the top of the uppermost chimney section
as shown in Figure 7.17.
Figure 7.15 Slide Grate Retaining Bracket into Notch
• Slide grate retainers into notches in bottom of back
refractory on each side as shown in Figures 7.15 and
7.16. Place one on each side of back refractory.
Figure 7.16 Grate Retaining Bracket in Place
• Replace hearth stone.
• Place grate into fireplace and slide back legs into
brackets to hold grate in place.
• Repalce smoke shield and screen assemblies.
CAUTION! Risk of Fire or Asphyxiation! DO NOT draw out-
side combustion air from wall, fl oor or ceiling cavity, or enclosed
spaces such as an attic or garage.
• DO NOT place outside air hood close to exhaust vents or
chimneys. Fumes or odor could be drawn into the room
through the fi replace.
• Locate outside air inlet to prevent blockage from leaves,
snow/ice, or other debris. Blockages could cause combustion
air starvation.
Heatilator • I100 • 35144 • Rev AA • 11/08
Figure 7.17 Possible Outside Air Inlet Locations