12
Ussc
Combustible Wall Chimney Connector Pass-Throughs
Method A. 12” (304.8 mm) Clearance to Combustible Wall Member: Using
a minimum thickness 3.5” (89 mm) brick and a 5/8” (15.9 mm) mini-
mum wall thickness clay liner, construct a wall pass-through. Th
e clay
liner must conform to ASTM C315 (Standard Specifi cation for Clay Fire
Linings) or its equivalent. Keep a minimum of 12” (304.8 mm) of brick
masonry between the clay liner and wall combustibles. Th
e clay liner shall
run from the brick masonry outer surface to the inner surface of the chim-
ney fl ue liner but not past the inner surface. Firmly grout or cement the
clay liner in place to the chimney fl ue liner.
Method B. 9” (228.6 mm) Clearance to Combustible Wall Member: Using
a 6” (152.4 mm) inside diameter, listed, factory-built Solid-Pak chimney
section with insulation of 1” (25.4 mm) or more, build a wall pass-through
with a minimum 9” (228.6 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” (228.6 mm) air
space. When fastening supports to chimney length, do not penetrate the
chimney liner (the inside wall of the Solid-Pak chimney). Th
e inner end of
the Solid-Pak chimney section shall be fl ush with the inside of the mason-
ry chimney fl ue, and sealed with a non-water soluble refractory cement.
Use this cement to also seal to the brick masonry penetration.
Method C. 6” (152.4 mm) Clearance to Combustible Wall Member: Start-
ing with a minimum 24 gage (.024” [.61 mm]) 6” (152.4 mm) metal chim-
ney connector, and a minimum 24 gage ventilated wall thimble which
has two air channels of 1” (25.4 mm) each, construct a wall pass-through.
Th
ere shall be a minimum 6” (152.4) mm separation area containing fi ber-
glass insulation, from the outer surface of the wall thimble to wall com-
bustibles. Support the wall thimble, and cover its opening with a 24-gage
minimum sheet metal support. Maintain the 6” (152.4 mm) space. Th
ere
should also be a support sized to fi t and hold the metal chimney connec-
tor. 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 fl ue 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 inches [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 chim-
ney 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 with and support chimney
section on both sides with 24 gage minimum sheet metal supports. See
that the supports are fastened securely to wall surfaces on all sides. Make
sure fasteners used to secure chimney fl ue line do not penetrate the inner
liner
.
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 fl ue liner face.
2. A chimney connector shall not pass through an attic or roof space, closet or similar concealed space, or a
fl oor, or ceiling.
