Martin Fireplaces SB5400SS User Manual

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, 23, and 24 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 form 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.

OUTSIDE AIR CONTROL 

OUTSIDE AIR CONTROL 
LEVER (LIFT TO OPEN,

LEVER (LIFT TO OPEN,
PULL DOWN TO CLOSE)

PULL DOWN TO CLOSE)

COMBUSTION AIR ASSEMBLY 

COMBUSTION AIR ASSEMBLY 
    FOR MODEL NO. AK-4

    FOR MODEL NO. AK-4

SCREWS

SCREWS

6" DIA. HOLE FOR AK-4 

6" DIA. HOLE FOR AK-4 

 NAIL

 NAIL
HOLES

HOLES