1. Use a minimum 3-1/2" thick brick masonry wall framed into the combustible wall. A fi reclay liner (ASTM C315 or
equivalent) having a 5/8" minimum wall thickness must be used and it must be at least 12" away from any material that could catch
fi re. Th
e inside diameter of the fi reclay liner shall be sized for the proper snug fi t of a 6" diameter chimney connector pipe. Th
e
fi reclay liner shall run from the outer surface of the brick wall to, but not beyond, the inner surface of the chimney fl ue and shall be
fi rmly cemented in place. See Part A of Figure 8.
2. Use a solid insulated listed factory-built chimney length having an inside diameter of 6" and having 1" or more of solid insulation.
Th
ere must be at least a 9" air space between the outer wall of the chimney length and any combustible materials. Th
e inner end of
the chimney length shall be fl ush with the inside of the masonry chimney fl ue shall be sealed to the fl ue and to the brick masonry
penetration with nonwater-soluble refractory cement. Sheet steel supports which are at least 24 gauge(0.024") in thickness shall be
securely fastened to wall surfaces on all sides. Fasteners between supports and the chimney length shall not penetrate the chimney
liner. See Part B of Figure 8.
3. Use a 10" diameter ventilated thimble made of at least 24 gauge(0.024") steel having two 1" air channels. Th
e ventilated thimble
must be separated from combustible materials by a minimum of 6" glass fi ber insulation. Th
e opening in the combustible wall shall
be covered and the thimble supported with sheet steel supports which are at least 24 gauge (0.024") in thickness. Th
e sheet steel sup-
ports shall be securely fastened to wall surfaces on all sides and shall be sized to fi t and hold the chimney section. Fasteners used to
secure chimney sections shall not penetrate chimney fl ue liner. See Part C of Figure 8.
4. Use an 8" inside diameter solid insulated listed factory-built chimney length which has 1" or more of solid insulation. Th
e
minimum length of this chimney section shall be 12" and will serve as a pass-through for the 6" diameter chimney connector. Th
ere
must be at least a 12" air space between the outer wall of the chimney section and any combustible materials. Th
e chimney section
shall be concentric with and spaced 1" away from the chimney connector by means of sheet steel support plates on both ends of the
chimney section. Th
e opening in the combustible wall shall be covered and the chimney section supported on both sides with sheet
steel supports which are at least 24 gauge (0.024") in thickness. Th
e sheet steel supports shall be securely fastened to wall surfaces
on all sides and shall be sized to fi t and hold the chimney section. Fasteners used to secure chimney sections shall not penetrate
chimney fl ue liner. See Part C of Figure 8.
5. A listed factory-built wall pass-through system may be purchased and installed according to the instructions packaged with it
to provide a safe method of passing the chimney connector through a combustible wall for connection to a masonry chimney.
Additional requirements pertaining to Figure 8 and the above wall pass-through systems:
1. Insulation material used as part of wall pass-through system shall be of noncombustible material and shall have a
thermal conductivity of 1.0 Btu • in./ft .² • °F (4.88 kg • cal/hr • m² • °C) or less
2. All clearances and thicknesses are minimums: larger clearances and thickness are acceptable.
3. A chimney thimble, as shown for 3" and 4" above (Parts C and D respectively of Figure 8) shall be for types "3" and 4" connec-
tions to facilitate removal of the chimney connector for cleaning. Th
e chimney thimble shall be of ASTM C315 fi reclay with 5/8"
minimum wall thickness , or material or equivalent durability. Th
e inside diameter of the thimble shall be sized for the proper snug
fi t of a 6" diameter chimney connector pipe. Th
e thimble shall be installed without damage to the chimney fl ue. Th
e thimble shall
extend through the chimney wall to, but not beyond, the inner surface of the chim ney fl ue and shall be permanently cemented in
place with high temperature cement.
4. A chimney connector to a masonry chimney, except for 2" above (Part B of Figure 8), shall extend through the wall pass-through
system to the inner face of the chimney fl ue, but not beyond. It does not have to be fastened in place so long as it cannot accidently
be pulled out of the chimney or shoved into the chimney fl ue. If fasteners are used to secure the chimney connector to a masonry
chimney, the fasteners shall not penetrate the chimney fl ue liner.
5. Any material used to close up any opening for the connector shall be noncombustible.
7
MINIMUM 12 IN.
TO COMBUSTIBLES
PART A, FIGURE 8
(FIGURE 8 CONTINUED ON NEXT PAGE)
CHIMNEY FLUE
MINIMUM CHIMNEY CLEARANCE TO
BRICK AND COMBUSTIBLES IS 2 IN.
MINIMUM CLEARANCES 12 IN.
OF BRICK ALL AROUND
CHIMNEY CONNECTOR
TO HEATER
FIRE CLAY LINER
(5/8" MIN. WALL THICKNESS)
MIN. 3-1/2" THICK BRICK
MASONRY WALL
MASONRY CHIMNEY
CONSTRUCTED TO
NFPA 211
