A. Minimum 3.5 inch thick brick masonry all framed into
combustible wall with a minimum of 12 inch brick
separation from clay liner to combustibles. The fireclay
liner shall run from the outer surface of brick wall to, but
not beyond, the inner surface of chimney flue liner and
shall be firmly cemented in place.
B. Solid-insulated, listed factory-build 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.
C. Sheet steel chimney connector, minimum 24 gauge
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.
D. Solid insulated, listed factory-build 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-thru 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.
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