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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 sec-
tion 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: Start-
ing 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 sup-
port. 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 sec-
tion. 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 chim-
ney 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.