Method C
Starting with a minimum 24 gauge 0.024” (0.6mm) 6”
(152mm) metal chimney connector, and a minimum 24
gauge ventilated wall thimble which has two air channels of
1” (25mm) each, construct a wall pass-through. There shall
be a minimum 6” (152mm) separation area containing
fiberglass insulation from the outer surface of the wall
thimble to wall combustibles. Support the wall thimble, and
cover it’s opening with a 24 gauge minimum sheet metal
support maintaining the 6” (152mm) space. There should
also be a support sized to fit and hold the metal chimney
connector. See that the supports are fastened securely to
wall surfaces on all sides. Make sure fasteners used to
secure the metal chimney connector do not penetrate the
chimney flue liner.
Method D
Start with a Solid-Pak listed factory built chimney section at
least 12” (305mm) long, with insulation of 1” (25mm) or
more, and an inside diameter of 8” (203mm) - 2” (50mm)
larger than the 6” (152mm) chimney connector. Use this as
a pass-through for a minimum 24 gauge single wall steel
chimney connector. Keep the Solid-Pak section concentric
with and spaced 1” (25mm) off the chimney connector by
way of sheet metal support plates at both ends of the
chimney section. Cover openings with and support the
chimney section on both sides with 24 gauge minimum
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