Monessen Hearth BWB400 - Manual (Page 23)

O
UTSIDE
C
OMBUSTION
A
IR
P
RECAUTIONS
& R
ECOMMENDATIONS
23
O
UTSIDE
C
OMBUSTION
A
IR
R
ECOMMENDATIONS
(
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
F
IGURE
27
53D9031. Rev 1 03/03