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Many building code inspectors follow these guidelines when approving
installations.
The methods approved by the NFPA are:
• Cutting away all combustible material in the wall a sufficient distance
from the single wall connector, to provide the required 12” (300 mm)
clearance for the connector. Any material used to close the opening
must be noncombustible (as in Fig . C).
• Using a section of double-wall chimney with a 9” (230 mm) clearance
to combustibles.
• Placing a chimney connector pipe inside a ventilated thimble, this is
then separated from combustibles by 6” (150 mm) of fiberglass
insulating material.
• Placing a chimney connector pipe inside a section of 9” (230 mm)
diameter, solid-insulated factory built chimney, with two inches of air
space between the chimney section and the combustibles.
Chimney connection is a freestanding installation Chimney connector enters chimney above the fireplace
An approved wall pass-through for the United States
A. Chimney connection is a freestanding installation B. Chimney connector enters chimney above the fireplace
C. An example of an approved wall pass-through
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