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Energy Distribution 2015 REVISION JULY 2020
10
CHIMNEY CONNECTOR SYSTEMS AND
CLEARANCES FROM COMBUSTIBLE
WALLS
FOR
R
ESIDENTIAL
H
EATING
A
PPLIANCES
A. Minimum 3.5in thick brick masonry all framed
into combustible wall with a minimum of 12in. brick
separation from clay liner to combustibles. The fire
clay 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.
B. Solid-insulated, listed factory-built chimney
length of the same inside diameter as the chimney
connector and having 1in. or more of insulation with a
minimum 9in. air space between the outer wall of the
chimney length and combustibles.
C. Sheet steel chimney connector, minimum 24
gauge in thickness, with a ventilated thimble, minimum
24 gauge in thickness, having two 1in. air channels,
separated from combustibles by a minimum of 6in 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-built chimney
length with an inside diameter 2in. larger than the
chimney connector and having 1in. 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 2in. air space between the
outer wall of chimney section and combustibles.
Minimum length of chimney section shall be 12in.
chimney section spaced 1in. 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 supports securely fastened to wall surfaces of
minimum 24-gauge thickness. Fasteners used to
secure chimney
section shall not penetrate chimney flue liner.