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- Brick Masonry
Minimum 3.5-inch thick brick masonry all framed into combustible wall
with a minimum of 2-inch brick separation from clay liner to
combustibles. The fireclay liner shall run from outer surface of brick
wall to, but not beyond, the inner surface of chimney flue liner and
shall be firmly cemented in place.
- Insulated Sleeve
Solid-insulated, listed factory-built chimney length of the same
inside diameter as the chimney connector and having 1-inch or more of
insulation with a minimum 9-inch air space between the outer wall of
the chimney length and combustibles.
- Ventilated Thimble
Sheet steel chimney connector, minimum 24 gauge in thickness, with a
ventilated thimble, minimum 24 gauge in thickness, having two 1-inch
air channels, separated from combustibles by a minimum of 6-inch of
glass fiber insulation. Opening shall be covered, and thimble
supported with a sheet steel support, minimum 24 gauge in thickness.
- Chimney Section Pass-through
Solid insulated, listed factory-built chimney length with an inside
diameter 2-inch larger than the chimney connector and having 1-inch or
more of insulation, serving as a pass-through for a single wall sheet
steel chimney connector of minimum 24 gauge thickness, with a minimum
2-inch air space between the outer wall of chimney section and
combustibles. Minimum length of chimney section shall be 12-inch
chimney section spaced 1-inch away from connector using sheet steel
support plates on both ends of chimney section. Opening shall be
covered, and chimney section supported on both sides with sheet steel
support securely fastened to wall surfaces of minimum 24 gauge
thickness. Fasteners used to secure chimney section shall not
penetrate chimney flue liner.
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