Heatilator BIR42-B Installation Manual page 15

WARNING! Risk of Fire!
on the both sides of the fireplace to prevent overheating
and fire..
Refer to Figures 3.8 and 3.9 when placing the outside air
inlet hoods.
• Cut a 6-1/2 in. (165 mm) hole in outside wall to
accommodate air piping.
• Use 6 in. (152 mm) flex (not supplied) to directly connect
outside air to fireplace intake. Insulate the pipe to prevent
frost condensation.
• Use the supplied outside air inlet hoods.
• Seal between the wall and the pipe with silicone to
prevent moisture penetration and air leaks.
• Seal between the outside air inlet hoods and the house
with silicone to prevent air infiltration.
CAUTION! Risk of Fire or Asphyxiation! DO NOT draw
outside combustion air from wall, floor or ceiling cavity, or
enclosed spaces such as an attic or garage.
DO NOT place outside air inlet hood close to exhaust
•
vents or chimneys. Fumes or odor could be drawn into
the room through the fireplace.
• Locate outside air inlet hood to prevent blockage from
leaves, snow/ice, or other debris. Blockages could cause
combustion air starvation and unit to overheat.
NOTICE: The fireplace provides some outside air for
combustion. Other methods may be necessary if more air
is required.
CAUTION! Risk of Cuts/Abrasions.
gloves and safety glasses during installation. Sheet metal
edges are sharp.
NO
NO
Outlet blocked by
snow, leaves, etc.
YES
Clear area
outside
house or in
ventilated
• Use UL181 Class 1 or Class 0 rigid or flexible ducting.
crawl space
• Install with short run and add a P-trap which will help
prevent flow of cold air.
• Secure flex duct with screws or wire ties.
Figure 3.8 Outside Air Installation
The outside air kits are installed
Wear protective
Garage or
NO
combustible
24" (610 mm) min.
liquids storage Attic space
48" (1220 mm) max.
NO
higher than 3 ft
termination cap
Seal
Factory-built
4" Duct-Use UL181
fireplace
Class 0 or Class 1
ducting
Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23
3 ft min. from
top of uppermost
chimney section
to air inlet.
Figure 3.9
Typical CAK Installation
Outlet placed
Seal
below the
Note: The pipe
cannot lay on top
of the unit.
Figure 3.10 P-Trap
Outside Air Inlet Locations
Typical Outside Air
Installation
Recommend
around 24 inches
for a minimum bend
Outside air is
required to be
installed on both
sides (right side not
shown)
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