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H. Outside Air Kit (optional)
If you install an outside air kit, Hearth & Home Technolo-
gies recommends you utilize the shortest duct run to op-
timize the performance of the outside air kit and install
a P-trap (see Figure 3.10). The outside air kit inlet hood
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 section to the outside air
inlet hood.
NOTE: The maximum length of a 4 inch diameter duct is
20 feet. The duct can be extended up to a maximum of 40
feet by using 6 inch duct. A 4 inch to 6 inch adapter will be
needed. (not included).
NOTE: The minimum cross-sectional area of the 4 inch
inlet hood is 7.0 square inches.
Refer to Figures 3.8 and 3.9 when placing the outside air
inlet hood.
The outside air kit is installed on the left hand side of the
fireplace.
•
Cut a 4-1/2 in. (114 mm) hole in outside wall to
accommodate air piping.
•
Use 4 in. (102 mm) flex (not supplied) to directly connect
outside air to fireplace intake. Insulate the pipe to prevent
frost condensation.
•
Use the supplied termination cap.
•
Seal between the wall and the pipe with silicone to
prevent moisture penetration and air leaks.
•
Seal between the termination cap 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 hood close to exhaust vents or
•
chimneys. Fumes or odor could be drawn into the room
through the fireplace.
•
Locate outside air inlet to prevent blockage from leaves,
24" (610 mm) min.
snow/ice, or other debris. Blockages could cause
48" (1220 mm) max.
combustion air starvation.
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
14
NO
Garage or
NO
combustible
Attic space
liquids storage
Seal
4" Duct-Use UL181
Class 0 or Class 1
ducting
Factory-built
fireplace
Heat & Glo • EM-415, EM-485T Installers Manual • 4017-268 • Rev S • 01/22
CAUTION! Risk of Cuts/Abrasions.
gloves and safety glasses during installation. Sheet metal
edges are sharp.
3 ft min. from
top of uppermost
chimney section
to air inlet.
Figure 3.9
Typical CAK Installation
Seal
NO
Outlet placed
higher than 3 ft
Note: The pipe
below the
termination cap
cannot lay on top
of the unit.
Figure 3.10 Outside Air Installation with Cold Air Trap
Outside Air Inlet Locations
Wear protective
Typical Outside Air
Installation
Recommend
around 24 inches
for a minimum bend
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