Monessen Hearth BWB400 Fire Pit User Manual


 
OUTSIDE COMBUSTION AIR PRECAUTIONS & RECOMMENDATIONS
23
OUTSIDE COMBUSTION AIR RECOMMENDATIONS (CONTINUED)
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. Refer to Figures 1 and 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 SLAB
CONCRETE SLAB
INSTALLATION 
INSTALLATION 
(OPTIONAL OUTSIDE
(OPTIONAL OUTSIDE
AIR RUNS)
AIR RUNS)
INLET GRILLE
INLET GRILLE
IN SOFFIT
IN SOFFIT
(OVERHANG)
(OVERHANG)
8' MAX.
8' MAX.
FIRESTOP SPACER
FIRESTOP SPACER
CAUTION:DO NOT TAKE 
CAUTION:DO NOT TAKE 
COMBUSTION AIR FROM
COMBUSTION AIR FROM
ATTIC SPACE OR GARAGE.
ATTIC SPACE OR GARAGE.
TERMINATION CAP
TERMINATION CAP
INSTALLATION ABOVE BASEMENT
OR CRAWL SPACE
OR CRAWL SPACE
FIRESTOP SPACER
FIRESTOP SPACER
TO OUTSIDE WALL
TO OUTSIDE WALL
DUCT EXTENDED
DUCT EXTENDED
TO MISS JOIST
TO MISS JOIST
SECOND FLOOR
SECOND FLOOR
45˚ CORNER
CORNER
INSTALLATION
INSTALLATION
ON SLAB FLOOR
ON SLAB FLOOR
(ONE WALL,
(ONE WALL,
INSIDE ROOM)
INSIDE ROOM)
INSIDE
WALL
WALL
OUTSIDE
OUTSIDE
WALL
WALL
ABOVE
ABOVE
SNOW
SNOW
LEVEL
GROUND 
GROUND 
LEVEL
BASEMENT 
BASEMENT 
WALL
WALL
PLATE
BASEMENT INSTALLATION
BASEMENT INSTALLATION
FIGURE 27
53D9031. Rev 1 03/03