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G. Outside Air Kit (optional)
If you install an outside air kit, Hearth & Home Technologies
recommends you utilize the shortest duct run to optimize
the performance of the outside air kit and install a P-trap
(See Figure 3.10). The outside air inlet hood should be po-
sitioned 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 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
24" (610 mm) min.
48" (1220 mm) max.
leaves, snow/ice, or other debris. Blockages could cause
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
Majestic Sovereign Series • SA36R/SA42R • Installers Manual • 4010-259 • Rev K • 1/22
14
NO
Garage or
Seal
NO
combustible
liquids storage
Attic space
4" Duct-Use UL181
Class 0 or Class 1
ducting
Factory-built
fireplace
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
Note: The pipe
Outlet placed
higher than 3 ft
cannot lay on top
below the
of the unit.
termination cap
Outside Air Inlet Locations
Figure 3.10 Outside Air Installation with Cold Air Trap
Wear protective
Typical Outside Air
Installation
Recommend
around 24 inches
for a minimum bend
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