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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 gauge (.024” [.61 mm]) 6”
(152.4 mm) metal chimney connector, and a minimum 24 gauge
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-gauge
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 gauge 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 do not penetrate 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.
A chimney connector shall not pass through an attic or roof
space, closet or similar concealed space, or a floor, or
ceiling.
