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CHIMNEY CONNECTOR SYSTEMS & CLEARANCES
NFPA 211 (US) NOTE: In Canada, installation must
conform to CAN/CSA-B365 when passing through
combustible construction.
A.
Brick Masonry - Minimum 3.5˝/89mm thick brick
masonry all framed into combustible wall with a
minimum of 12˝/305mm 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.
B.
Insulated Sleeve - Solid-insulated, listed factory-
built chimney length of the same inside
diameter as the chimney connector and having
1˝/25.4cm or more of insulation with a minimum
9˝/229mm air space between the outer wall of
the chimney length and combustibles.
C.
Ventilated Thimble - Sheet steel chimney
connector, minimum 24 gauge in thickness,
with a ventilated thimble, minimum 24 gauge in
thickness, having two 1˝/25.4mm air channels,
separated from combustibles by a minimum
of 6˝/152mm of glass fiber insulation. Opening
shall be covered, and thimble supported with
a sheet steel support, minimum 24 gauge in
thickness.
D.
Chimney Section Pass-through - Solid insulated,
listed factory-built chimney length with an inside
diameter 2˝/51mm larger than the chimney
connector and having 1˝/25.4mm 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˝/51mm air space between the outer wall of
chimney section and combustibles. Minimum
length of chimney section shall be 12˝/305mm
chimney section spaced 1˝/25.4mm 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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