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BUF Vent-Free Fireboxes
COMBUSTION AIR
1. Locate combustion air assembly at an exterior location
which is not likely to be accidentally blocked in any man-
ner. Locate assembly a min. of 12" above the snow line
to prevent blockage by snow accumulation.
2. Never mount the combustion air inlet assembly in 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 un-
der a house when an adequate supply of air is provided
by open ventilation.
4. CAUTION: Do not take combustion air from attic
space or garage space.
5. Locate air supply inlet at least 3' away from any appli-
ance vent terminal.
6. 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. Refer to Figures
11 through 14 for methods of installing the outside air
for combustion assemblies.
Above
Snow
Level
Ground
Level
Figure 11 -
Basement Installation
NOTE: Fireplace model in illustrations may not be
FP2459
representative of your appliance.
OA basement install
12
8' Max.
Figure 12 -
Concrete Slab Installation
(Optional Outside Air Runs)
Duct
Extended
to Miss
Joist
Figure 13 -
Installation Above Basement or
Crawl Space
FP2459
Outside
Wall
COMBUSTION AIR
Inlet Grille
in Soffit
(Overhang)
FP2460
OA slab install
To Outside Wall
FP2461
above basement
Inside Wall
Figure 14 -
45° Corner Installation
on Slab Floor
FP2462
OA corner install
FP2460
FP2461
FP2462
61D1013
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