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VGZ-025 | 20120424.0
A. Brick Masonry
Minimum 3.5˝/89mm thick brick masonry all framed into com-
bustible 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, sepa-
rated 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 connec-
tor and having 1˝/25.4mm or more of insulation, serving as
a pass-through for a single wall sheet steel chimney con-
nector 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 sup-
port 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.
ChImNEY CONNECTOR SYSTEmS & ClEARANCES
