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OUTSIDE COMBUSTION AIR PRECAUTIONS & RECOMMENDATIONS
1. Extremely long runs and numerous turns in the duct leading from the fireplace to the combustion air
assembly should be avoided. These conditions will increase the resistance to the free flow of air through
the duct. See Figure 27 for methods of installing the outside air for combustion assemblies.
2. The combustion air assembly should be located at an exterior location, which is not likely to be accidentally
blocked in any manner. The assembly should be located above the snow line to prevent blockage by snow
accumulation.
3. The combustion air inlet assembly should never be mounted in a garage or storage area where combustible
fumes such as gasoline might be drawn into the fireplace.
4. Combustion air can be drawn from the crawl space under a house when an adequate supply of air is
provided by open ventilation.
5. Do not take combustion air from attic space or garage space.
CONCRETE SLABCONCRETE SLAB
INSTALLATION INSTALLATION
(OPTIONAL OUTSIDE(OPTIONAL OUTSIDE
AIR RUNS)AIR RUNS)
INLET GRILLEINLET GRILLE
IN SOFFIT IN SOFFIT
(OVERHANG)(OVERHANG)
8' MAX.8' MAX.
FIRESTOP SPACERFIRESTOP SPACER
CAUTION:DO NOT TAKE CAUTION:DO NOT TAKE
COMBUSTION AIR FROMCOMBUSTION AIR FROM
ATTIC SPACE OR GARAGE. ATTIC SPACE OR GARAGE.
TERMINATION CAPTERMINATION CAP
INSTALLATION ABOVE BASEMENTINSTALLATION ABOVE BASEMENT
OR CRAWL SPACE OR CRAWL SPACE
FIRESTOP SPACERFIRESTOP SPACER
TO OUTSIDE WALLTO OUTSIDE WALL
DUCT EXTENDEDDUCT EXTENDED
TO MISS JOISTTO MISS JOIST
SECOND FLOOR SECOND FLOOR
45˚ CORNER
INSTALLATION
ON SLAB FLOOR
(ONE WALL,
INSIDE ROOM)
INSIDE
WALL
OUTSIDE
WALL
ABOVE
SNOW
LEVEL
GROUND
LEVEL
BASEMENT
WALL
PLATE
BASEMENT INSTALLATIONBASEMENT INSTALLATION
FIGURE 27
53D9033. Rev 1 03/03