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G. Outside Air Kit
Outside air kits must be used for combustion and to pro-
vide cooling air to prevent overheating. Hearth & Home
Technologies recommends you utilize the shortest duct run
to optimize the performance of the outside air kit. The out-
side air inlet hoods should be positioned in a manner that
will not allow snow, leaves, etc. to block the inlet. In some
installations the air duct may need to be run vertically. In
such an installation, a 3 ft (914 mm) height difference must
be maintained from the top of the uppermost chimney sec-
tion to the outside air inlet hoods.
Refer to Figures 3.8 and 3.9 when placing the outside air
inlet hoods.
WARNING! Risk of Fire! The outside air kits are installed
on the both sides of the fireplace to prevent overheating
and fire..
•
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 hood.
•
Seal between the wall and the pipe with silicone to
prevent moisture penetration and air leaks.
•
Seal between the outside air inlet hood 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.
14
Heat & Glo • Rutherford 42-B Installation Manual • 4059-712 • Rev O • 09/28/15
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 or mainly straight duct, except small
dip for cold air trap which will help prevent flow of cold air.
• Secure flex duct with screws or wire ties.
Figure 3.9
Outside Air Installation
CAUTION! Risk of Cuts/Abrasions. Wear protective
gloves and safety glasses during installation. Sheet metal
edges are sharp.
3 ft min. from
top of uppermost
chimney section
to air inlet.
Figure 3.8
Outside Air Inlet Locations
NO
Garage or
NO
combustible
liquids storage
Attic space
Factory-built
fireplace
Outside air installed
on both sides (right
side not shown)
NO
Outlet placed
higher than 3 ft
below the
termination cap
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