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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 4” (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. 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 6” (2 inches [51 mm] larger than
the 4” [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 are used to secure chimney flue liner.
NOTE:
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.
