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Combustible Wall Chimney Connector Pass-Throughs
A
B
C
D
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.
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-gage 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
Make sure fasteners used to secure chimney flue liner.
all sides.
Page 10
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