Martin SF42 Series Installation, Operation And Maintenance Manual page 23

O C
UTSIDE OMBUSTION
O C A
UTSIDE OMBUSTION
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.
F 27
IGURE
ABOVE ABOVE
SNOW SNOW
LEVEL
GROUND GROUND
LEVEL
BASEMENT INSTALLATION BASEMENT INSTALLATION
DUCT EXTENDED
TO MISS JOIST
TO OUTSIDE WALL
INSTALLATION ABOVE BASEMENT
OR CRAWL SPACE OR CRAWL SPACE
A
IR
R (
IR ECOMMENDATIONS CONTINUED
PLATE
BASEMENT BASEMENT
SECOND FLOOR
FIRESTOP SPACER
P
RECAUTIONS
)
TERMINATION CAP
WALL WALL
8' MAX.
OUTSIDE OUTSIDE
WALL WALL
& R
ECOMMENDATIONS
CAUTION:DO NOT TAKE
COMBUSTION AIR FROM
ATTIC SPACE OR GARAGE.
INLET GRILLE
IN SOFFIT
(OVERHANG)
CONCRETE SLAB
INSTALLATION
(OPTIONAL OUTSIDE
AIR RUNS)
45˚ CORNER CORNER
INSTALLATION INSTALLATION
ON SLAB FLOOR ON SLAB FLOOR
(ONE WALL, (ONE WALL,
INSIDE ROOM) INSIDE ROOM)
53D9022. Rev 1 03/03
FIRESTOP SPACER
INSIDE
WALL WALL
23