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C
i
HimneY
nstAllAtion
Here are four (4) methods of combustible wall chimney connector pass-throughs. Information was provided from NFPA 211.
Minimum chimney clearance to brick
and combustibles 2 inches (50.8 mm)
Minimum 12 inches
(304.8 mm) to combustibles
Figure 26: Chimney Through Wall - Method A.
Minimum chimney clearance from masonry to sheet
steel supports and combustibles 2 inches (50.8 mm)
Non-soluble
retractory
Factory-built
cement
chimney length
Chimney length
flush with inside
of flue
Air space 9 inches
(228.6 mm) minimum
Masonry chimney
Figure 27: Chimney Through Wall - Method B.
Minimum chimney clearance to sheet steel
supports and combustibles 2 inches (50.8 mm)
Two ventilated air channels
each 1 inch (25.4 mm).
Construction of sheet steel
Masonry
chimney
Figure 28: Chimney Through Wall - Method C.
Figure 29: Chimney Through Wall - Method D.
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 flue liner face.
2. A chimney connector shall not pass through an attic or roof space, closet or similar concealed space, or a floor, or ceiling.
Installation
t
w
:
HrougH
All
}
Minimum clearance
12 inches (304.8 mm)
of brick
Chimney
connector
Fire clay liner
Masonry
chimney
}
Minimum clearance
9 inches (228.6 mm)
Chimney
connector
Use chimney
manufacturer's
parts to attach
connector securely
Solid-insulated,
listed factory-built
chimney length
Sheet steel supports
Two air channels each
1 inch (25.4 mm)
}
Chimney
connector
}
Minimum 6 inches
(152.4 mm) glass
fiber insulation
Sheet steel
supportrs
Method A. 12" (304.8 mm) Clearance to Combustible Wall Member:
Using a minimum thickness 3.5" (89 mm) brick and a ⅝" (15.9 mm)
minimum wall thickness clay liner, construct a wall pass-through. The
clay liner must conform to ASTM C315 (Standard Specification for Clay
Fire Linings) or its equivalent. Keep a minimum of 12" (305 mm) 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 flue liner but not past the inner surface. Firmly grout or
cement the clay liner in place to the chimney flue liner.
Method B. 9" (229 mm) Clearance to Combustible Wall Member: Using
a 6" (152 mm) inside diameter, factory-built Solid-Pak chimney section
with insulation of 1" (25.4 mm) or more, build a wall pass-through
with a minimum 9" (229 mm) 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" (229
mm) 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 flush with the
inside of the masonry chimney flue and sealed with a non-water soluble
refractory cement. Use this cement to also seal to the brick masonry
penetration.
Method C. 6" (152.4 mm) Clearance to Combustible Wall Member:
Starting with a minimum 24 gauge (.024" [0.6 mm]) 6" (152.4 mm)
metal chimney connector and a minimum 24 gauge ventilated wall
thimble which has two air channels of 1" (25.4 mm) each, construct a
wall pass-through. There shall be a minimum 6" (152.4 mm) separation
area containing fiberglass 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" (152.4 mm) 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 chimney flue liner.
Method D. 2" (50.8 mm) Clearance to Combustible Wall Member:
Start with a solid-pak listed factory-built chimney section at least 12"
(304 mm) long, with insulation of 1" (25.4 mm) or more, and an inside
diameter of 8" (2" [51 mm] larger than the 6" [152.4 mm] 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" (25.4 mm) off the chimney connector by way of sheet
metal support plates at both ends of chimney section. Cover opening,
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 are used to secure
chimney flue liner.
29
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