-8-
CONNECTION OF CHIMNEY CONNECTOR TO A MASONRY
CHIMNEY THROUGH A COMBUSTIBLE WALL
Figure 8 shows how to connect the chimney connector of a heater
to a masonry chimney through a combustible wall. There are five
allowable ways that a chimney connector can be connected to
a masonry chimney by passing through a combustible wall. NFPA
Standard 211 allows the following wall pass-through systems.
1. Use a minimum 3-1/2" thick brick masonry wall framed into the
combustible wall. A fireclay 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
fire. The inside diameter of the fireclay liner shall be sized for
the proper snug fit of a 6" diameter chimney connector pipe.
The fireclay liner shall run from the outer surface of the brick
wall to, but not beyond, the inner surface of the chimney flue
and shall be firmly cemented in place (see Part A).
2. Use a solid insulated listed factory-built chimney length having
an inside diameter of 6" and 1" or more of solid insulation.
There must be at least a 9" air space between the outer wall
of the chimney length and any combustible materials. The
inner end of the chimney length shall be flush with the inside
of the masonry chimney, the flue shall be sealed to the flue
and to the brick masonry penetration with non-water-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).
3. Use a 10" diameter ventilated thimble made of at least 24
gauge(0.024") steel having two 1" air channels. The ventilated
thimble must be separated from combustible materials
by a minimum of 6" glass fiber insulation. The 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. The sheet steel supports shall be
securely fastened to wall surfaces on all sides and shall be
sized to fit and hold the chimney section. Fasteners used to
secure chimney sections shall not penetrate chimney flue
liner (see Part C).
4. Use an 8" inside diameter solid insulated listed factory-built
chimney length which has 1" or more of solid insulation. The
minimum length of this chimney section shall be 12" and
will serve as a pass-through for the 6" diameter chimney
connector. There must be at least a 12" air space between
the outer wall of the chimney section and any combustible
materials. The 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. The 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.
The sheet steel supports shall be securely fastened to wall
surfaces on all sides and shall be sized to fit and hold the
chimney section. Fasteners used to secure chimney sections
shall not penetrate chimney flue liner (see Part C).
5. A listed factory-built wall pass-through system may be
purchased and installed according to the instructions pack
aged with it to provide a safe method of passing the chimney
connector through a combustible wall for connection to a
masonry chimney.
MASONRY CHIMNEY
CONSTRUCTED TO
NFPA 211
AIRTIGHT
CLEANOUT
DOOR
FLOOR
PROTECTOR
COMBUSTIBLE WALL
TO
HEATER
CHIMNEY CONNECTOR
CEILING
SEE PARTS A, B,
C, D, AND E OF
THIS FIGURE FOR
OPTIONS.
CHIMNEY FLUE
FIGURE 8 -
CONNECTION OF CHIMNEY CONNECTOR TO A
MASONRY CHIMNEY THROUGH A COMBUSTIBLE
WALL
(FIGURE 8 CONTINUED ON NEXT PAGE)
Summary of Contents for US1269E
Page 16: ...16 Notes...
