Monessen Hearth 36" and 42" Wood Burning Fireplaces BWB400A - Manual (Page 26)

26 61D0006
OUTSIDE COMBUSTION AIR PRECAUTIONS AND RECOMMENDATIONS
COMBUSTION AIR
(CONTINUED)
Figure 31 - 45° Corner Installation on Slab Floor
Figure 30 - Installation Above Basement or
Crawl Space
Do not take combustion
air from attic space or
garage.
CAUTION
One Wall,
Inside Room
Inside Wall
Outside
Wall
Second Floor
Firestop
Spacer
Duct Extended
to Miss Joist
To Outside Wall