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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
10
minimum 6" (152.4) mm separation area containing
fiberglass insulation, from the outer surface of the
wall thimble to wall combustibles.
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.
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:
Connectors
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.
A chimney connector shall not pass through an attic
or roof space, closet or similar concealed space, or
a floor, or ceiling.
Support the
Cover
to
a
masonry
chimney,
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