
Combustible Wall Chimney Connector Pass-Throughs
Method A. 12” Clearance to Combustible Wall Member: Using a minimum
thickness 3.5” brick and a 5/8” 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”
of brick masonry between the clay liner and 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” Clearance to Combustible Wall Member: Using a 6” inside
diameter, listed, factory-built Solid-Pak chimney section with insulation of 1”
or more, build a wall pass-through with a minimum 9” air space between the
outer wall of the chimney length and wall combustibles. Use sheet metal
supports fastened securely to wall surfaces on all sides, to maintain the 9”
air space. When fastening supports 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-water soluble refractory cement. Use
this cement to also seal to the brick masonry penetration.
Method C. 6” Clearance to Combustible Wall Member: Starting with a
minimum 24 gage (.024”), 6” metal chimney connector, and a minimum 24
gage ventilated wall thimble which has two air channels of 1” each, construct
a wall pass-through. There shall be a minimum 6” separation area containing
fiberglass insulation, from the outer surface of the wall thimble to wall
combustibles. Support the wall thimble, and cover its opening with a 24-
gage minimum sheet metal support. Maintain the 6” space. There should
also be a support sized to fit and hold the metal chimney connector. See that
the supports are fastened securely to wall surfaces on all sides. Make sure
fasteners used to secure the metal chimney connector do not penetrate
chimney flue liner.
Method D. 2” Clearance to Combustible Wall Member: Start with a solid-
pak listed factory built chimney section at least 12” long, with insulation of 1”
or more, and an inside diameter of 8” (2 inches larger than the 6” 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” off the chimney connector by way of sheet 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 shall not penetrate chimney flue
liner.
NOTES:
1. Connectors to a masonry chimney, excepting method B, shall extend in one continuous section through the wall pass-through system and the
chimney wall, to but not past the inner flue 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.