2.
Solid insulated listed factory-built chimney length
of the same inside diameter as the chimney
connector and having 1” (25mm) or more of insu-
lation with a min. 9” (229mm) air space between
the outer wall of the chimney length and com-
bustibles. The inner end of the chimney length
shall be flush with the inside of the masonry
chimney flue and shall be sealed to the flue and
to the brick masonry penetration with nonwater-
soluble refractory cement. Supports should be
securely fastened to wall surfaces on all sides.
Fasteners between supports and the chimney
length shall not penetrate the chimney liner.
4.
Solid insulated listed factory-built chimney length
with an inside diameter 2” (50mm) larger than the
chimney connector and having 1” (25mm) or
more of insulation, serving as a pass-through for
a single wall sheet steel chimney connector of
min. 24 gauge thickness, with a min. 2” (50mm)
air space between the outer wall of chimney sec-
tion and combustibles. Min. length of chimney
section shall be 12” (305mm). Chimney section
concentric with and spaced 1” (25mm) away from
connector by means of 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 of min. 24
gauge thickness.
Supports should be securely fastened to wall surfaces on
all sides and shall be sized to fit and hold chimney sec-
tion. Fasteners used to secure chimney sections should
not penetrate chimney flue liner.
3.
Sheet steel chimney connector, min. 24 gauge in
thickness, with a ventilated thimble, min 24
gauge in thickness, having two 1” (25mm) air
channels, separated from combustibles by a min.
of 6” (150mm) of glass fibre insulation. Opening
should be covered and thimble supported with a
sheet steel support, min. 24 gauge in thickness.
Supports should be securely fastened to wall sur-
faces on all sides and should be sized to fit and
hold chimney section. Fasteners used to secure
chimney sections should not penetrate chimney
flue liner.
4
Fig3
Fig.4
Fig.5
Fig.6
(50mm)
(229mm)
minimum
Minimum
clearance 9”
(229mm)
(50mm)
(25mm)
(150mm)
glass fibre insulation
Two ventilated air
channels each 1”
(25mm) constructed of
sheet steel
(50mm)
Minimum clearances 2” (50mm)
1” (25mm)
air space to
chimney
length
Air space 2” (50mm)
