Wall Pass-Throughs
Whenever possible, design your installation so that the wall connector does not pass through a
combustible wall. If you are considering a wall pass-through in your installation, check with your
building inspector before you begin. Also check with the chimney connector manufacturer for
any specific requirements.
Accessories are available for use as wall pass-throughs. If using one of these, make sure it has
been tested and listed for use as a wall pass-through. We recommend the following guidelines
when passing chimney connectors through combustible walls:
Cut 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 non-combustible (as in Fig. C below).
Using a section of double-wall chimney with a 9” (230 mm) clearance to combustibles.
Placing a chimney connector pipe inside a ventilated thimble, which 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.
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