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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 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 do not penetrate chimney flue liner.
NOTES:
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.
COMBUSTIBLE WALL CHIMNEY CONNECTOR PASS-THROUGHS
