12
COMBUSTIBLE WALL CHIMNEY CONNECTOR PASS-THROUGHS
Method A. 12” (304.8 mm) Clearance to Combustible
Wall Member: Using a minimum thickness 3.5” (89 mm)
brick and a 5/8” (15.9 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”
(304.8 mm) 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” (228.6 mm) Clearance to Combustible Wall
Member: Using a 6” (152.4 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” (228.6 mm) 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” (228.6 mm) 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” (152.4 mm) Clearance to Combustible Wall
Member: Starting with a minimum 24 gage (.024” [.61 mm])
6” (152.4 mm) metal chimney connector, 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” (152.4) mm 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” (152.4 mm) 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” (50.8 mm) Clearance to Combustible
Wall Member: Start with a solid-pak listed factory built
chimney section at least 12” (304 mm) long, with insulation
of 1” (25.4 mm) or more, and an inside diameter of 8” (2
inches [51 mm] larger than the 6” [152.4 mm] chimney
connector). Use this as a pass-through for a minimum
24-gauge single wall steel chimney connector. Keep solid-
pak section concentric with and spaced 1” (25.4 mm) 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 flue line.
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.