Heatilator Birmingham BIR42-B Installation Manual page 14

WARNING! Risk of Fire!
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inlets.
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• Use the supplied outside air inlet hoods.
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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
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• Locate outside air inlet hood to prevent blockage from
leaves, snow/ice, or other debris. Blockages could cause
combustion air starvation and unit 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. liquids storage
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
 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev AD • 06/23
The outside air kits are installed
Wear protective
Garage or
NO
combustible
Attic space
NO
Outlet placed
higher than 3 ft
termination cap
Factory-built
fireplace
3 ft min. from
top of uppermost
chimney section
to air inlet.
Figure 3.9
below the
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)