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16 62D4036
8' Maximum
OUTSIDE COMBUSTION AIR PRECAUTIONS AND RECOMMENDATIONS
Note: The use of outside air for combustion
is optional unless required by building
codes. It is only necessary to supply
outside combustion air to one side of
fireplace. Use model OAC4 combustion
air kit (see page 17).
1. Avoid extremely long runs and numerous
turns in duct leading from fireplace to combus
-
tion air assembly. These conditions increase
the resistance to free flow of air through duct.
See Figures 11 and 12.
2. Locate combustion air assembly at an exterior
location. Make sure the location cannot be
accidentally blocked. Locate assembly above
snow line to prevent snow from blocking
assembly.
3. Never mount combustion air inlet assembly
in garage or storage area where combus
-
tible fumes (gasoline) might be drawn into
fireplace.
4. Combustion air may be drawn from crawl
space under house when adequate supply
of air is provided by open ventilation. See
Figure 11.
Note: Never take combustion air from attic
space or garage space.
Note: Install outside combustion air ONLY
ON LEFT-HAND SIDE of fireplace.
Figure 11 - Installing Unit Above Basement or Crawl Space
Figure 12 - Installing Unit on Concrete Slab with Optional
Outside Air Runs
Duct
Extended to
Miss Joist
To Outside Wall
Inlet Grill in Soffit
(Overhag)