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8
Combustion Air
AK22 INSTALLATION
Note: The AK22 is an optional accessory that can be used
to bring in fresh air. Use of the AK22 is not required for
operation unless specified by local codes.
1. Locate combustion air assembly at an exterior location
which is not likely to be accidentally blocked in any man-
ner. Locate assembly a min. of 12" above the snow line
to prevent blockage by snow accumulation.
2. Never mount the combustion air inlet assembly in a ga-
rage or storage area where combustible fumes such as
gasoline might be drawn into the fireplace.
3. Combustion air can be drawn from the crawl space under
a house when an adequate supply of air is provided by
open ventilation.
4. CAUTION: Do not take combustion air from attic space
or garage space.
5. Locate air supply inlet at least 3' away from any appliance
vent terminal.
6. Avoid extremely long runs and numerous turns in the duct
leading from the fireplace to the combustion air assembly.
These conditions increase the resistance to the free flow
of air through the duct. Refer to Figures 8.1 through 8.4
for methods of installing the outside air for combustion
assemblies.
Above
Snow
Level
Ground
Level
Figure 8.1 Basement Installation
NOTE: Fireplace model in illustrations may not be
FP2459
representative of your appliance.
OA basement install
16
Monessen • LCUF32/36/42 Installation and Operating Manual • 4607-900 • Rev D • 3/21
Inlet Grille
in Soffit
15' Max.
(Overhang)
Figure 8.2 Concrete Slab Installation (Optional Outside Air Runs)
FP2460
OA slab install
Duct
Extended
to Miss
Joist
To Outside Wall
Figure 8.3 Installation Above Basement or Crawl Space
FP2461
above basement
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