10
Chimney Installation Through Wall
Here are four methods combustible wall chimney connector pass-throughs. Information was provided from NFPA 211.
Method A. 12” (304.8mm) Clearance to Combustible Wall
Member: Using a minimum thickness 3.5” (89mm) brick and a ”
(15.9mm) minimum wall thickness clay liner, construct a wall pass-
through. The clay liner must conform to ASTM C315 (Standard
Specication for Clay Fire Linings) or its equivalent. Keep a minimum
of 12” (304.8mm) of brick masonry between the clay liner and wall
combustibles. The clay liner shall run from the brick masonry outer
surface to the inner surface of the chimney ue liner but not past the
inner surface. Firmly grout or cement the clay liner in place to the
chimney ue liner.
Method B. 9” (228.6mm) Clearance to Combustible Wall Member:
Using a 6” (152.4mm) inside diameter, factory-built Solid-Pak
chimney section with insulation of 1” (25.4mm) or more, build a wall
pass-through with a minimum 9” (228.6mm) air space between the
outer wall of the chimney length and wall combustibles. Use sheet
metal supports fastened securely to wall surfaces on all sides, to
maintain the 9” (228.6mm) air space. When fastening supports to
chimney length, do not penetrate the chimney liner (the inside wall
of the Solid-Pak chimney). The inner end of the Solid-Pak chimney
section shall be ush with the inside of the masonry chimney ue,
and sealed with a non-water soluble refractory cement. Use this
cement to also seal to the brick masonry penetration.
Method C. 6” (152.4mm) Clearance to Combustible Wall Member:
Starting with a minimum 24 gauge (.024” [0.61mm]) 6” (152.4mm)
metal chimney connector, and a minimum 24 gauge ventilated wall
thimble which has two air channels of 1” (25.4mm) each, construct
a wall pass-through. There shall be a minimum 6” (152.4mm)
separation area containing berglass insulation, from the outer
surface of the wall thimble to wall combustibles. Support the wall
thimble, and cover its opening with a 24 gauge minimum sheet metal
support. Maintain the 6” (152.4mm) space. There should also be a
support sized to t 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 chimney ue liner.
Method D. 2” (50.8mm) Clearance to Combustible Wall Member:
Start with a solid-pak listed factory built chimney section at least 12”
(304mm) long, with insulation of 1” (25.4mm) or more, and an inside
diameter of 8” (2” [51mm] larger than the 6” [152.4mm] chimney
connector). Use this as a pass-through for a minimum 24 gauge
single wall steel chimney connector. Keep solid-pak section concentric
with and spaced 1” (25.4mm) off the chimney connector by way of
sheet metal support plates at both ends of chimney section. Cover
opening with and support chimney section on both sides with 24
gauge minimum sheet metal supports. See that the supports are
fastened securely to wall surfaces on all sides. Make sure fasteners
used to secure chimney ue liner.
Two ventilated air channels
each 1 inch (25.4 mm).
Construction of sheet steel
Minimum 6 inches
(152.4 mm) glass
fiber insulation
Two air channels each
1 inch (25.4 mm)
Minimum chimney clearance to sheet steel
supports and combustibles 2 inches (50.8 mm)
Minimum 12 inches
(304.8 mm) to combustibles
Minimum clearance
12 inches (304.8 mm)
of brick
Minimum chimney clearance to brick
and combustibles 2 inches (50.8 mm)
Factory-built
chimney length
Chimney length
flush with inside
of flue
Solid-insulated,
listed factory-built
chimney length
Use chimney
manufacturer’s
parts to attach
connector securely
Minimum clearance
9 inches (228.6 mm)
Air space 9 inches
(228.6 mm) minimum
Minimum chimney clearance from masonry to sheet
steel supports and combustibles 2 inches (50.8 mm)
Non-soluble
retractory
cement
NOTES:
1. Connectors to a masonry chimney, excepting method B, shall extend in one continuous section through the wall pass-through
system and the chimney wall, to but not past the inner ue liner face.
2. A chimney connector shall not pass through an attic
or roof space, closet or similar concealed space, or a oor, or ceiling.
A
D
C
B
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