Monessen Hearth BWB400A Installation And Operating Instructions Manual page 26

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