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
Duct
Extended to
Miss Joist
To Outside Wall 
Figure 11 - Installing Unit Above Basement or Crawl Space
Inlet Grill in Soffit
(Overhag)
8' Maximum
Figure 12 - Installing Unit on Concrete Slab with Optional
Outside Air Runs
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