Martin Fireplaces 400BWBIA - Manual (Page 25)

61D0008 25
8'max.
OUTSIDE COMBUSTION AIR PRECAUTIONS AND RECOMMENDATIONS
COMBUSTION AIR
1. Locate combustion air assembly at an exterior location which is not likely to be accidentally blocked in any manner.
Locate assembly above the snow line to prevent blockage by snow accumulation.
2. Never mount the combustion air inlet assemblyin a garage or storage area where combustible fumes such as gasoline
might be drawn into the fireplace.
3. Combustion air can be drawn from the crawl space under a house when an adequate supply of air is provided by open
ventilation.
4. Do not take combustion air from attic space or garage space.
5. Avoid extremely long runs and numerous turns in the duct leading from the fireplace to the combustion air assembly.
These conditions increase the resistance to the free flow of air through the duct. See Figures 28 through 31 for methods
of installing the outside air for combustion assemblies.
Continued
Figure 28 - Basement Installation
Figure 29 - Concrete Slab Installation
(Optional Outside Air Runs)
Above
Snow
Level
Ground
Level
Plate
Basement
Wall
Termination Cap
Firestop Spacer
Inlet Grill
in Soffit
(Overhang)
Do not take combustion
air from attic space or
garage.
CAUTION