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2.8 Combustible Wall Chimney Connector Pass-Throughs
Method A. 12” (305 mm) Clearance to Combustible Wall Member: Using a
minimum thickness of 3.5” (90 mm) brick and a 5/8” (16 mm) minimum
wall thickness clay liner, construct a wall pass-through. The clay liner must
conform to ASTM C315 (Standard Specification for Clay Fire Linings) or
its equivalent. Keep a minimum of 12” (305 mm) of brick masonry between
the clay liner und wall combustibles. The clay liner shall run from the brick
masonry outer surface to the inner surface of the chimney flue liner but not
past the inner surface. Firmly grout or cement the clay liner in place to the
chimney flue liner.
Method B. 9” (229 mm) Clearance to Combustible Wall Member: Using 6”
(152 mm) inside diameter, listed, factory-built Solid-Pak chimney section
with insulation of 1” (25.4 mm) or more, build a wall pass-through with a
minimum 9” (229 mm) air space between the outer wall of chimney length
and wall combustibles. Use sheet metal supports fastened securely to wall
surfaces on all sides, to maintain the 9” (229 mm) air space. When fastening
support to chimney length, do not penetrate the chimney liner (the inside
wall of the Solid-Pak chimney). The inner end of the Solid-Pak chimney
section shall be flush with the inside of the masonry chimney flue and
sealed with a non-watersoluble, refractory cement. Use this cement to also
seal to the brick masonry penetration.
Method C. 6” (152 mm) Clearance to Combustible Wall Member: Starting
with a minimum 24 gage (.024 inch [.61 mm]), 6” metal chimney connec-
tor, and a minimum 24 gage ventilated wall thimble which has two air
channels of 1” ( 25.4 mm) each, construct a wall pass-through. There shall
be a minimum 6” (152 mm) separation area containing fiber glass insula-
tion, from the wall thimble, and cover its opening with a 24-gage minimum
sheet metal support. Maintain the 6” (152 mm) space. There should also be
a support sized to fit and hold the metal chimney connector. See that the
support is fastened securely to wall surfaces on all sides. Make sure fasten-
ers used to secure the metal chimney connector do not penetrate chimney
flue liner.
Method D. 2” (51 mm) Clearance to Combustible Wall Member: Start with
a Solid-Pak listed factory built chimney section, at least 12” (305 mm) long,
with insulation of 1” (25.4 mm) or more, and an inside diameter of 8” (2”
[51 mm] larger than the 6” [152 mm] chimney connector). Use this as a
pass-through for a minimum 24 gage single wall steel chimney connector.
Keep Solid-Pak section concentric with and spaced 1” (25.4 mm) off the
chimney connector by wall of steel metal support plates at both ends of
chimney section. Cover opening with and support chimney section on both
sides with 24 gage minimum sheet metal supports. See that the supports are
fastened securely to wall surfaces on all sides. Make sure fasteners used to
secure chimney section do not penetrate chimney flue liner.
NOTES:
1. Connectors to a masonry chimney, except for method B, shall extend in one continuous section through the wall
pass-through system and the chimney wall, up to but not past the inner liner face.
2. A chimney connector shall not pass through an attic or roof space, closet or similar concealed space, or a floor or
ceiling.
3. Where passage through a wall or partition of combustible construction is desired, the installation shall conform to
CAN/CSA-B365.