United States Stove Company 1261 - Manual (Page 9)

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CONNECTION OF CHIMNEY CONNECTOR TO A MASONRY CHIMNEY WHEN CHIMNEY CONNECTOR
DOES NOT PASS THROUGH A COMBUSTIBLE WALL
PART E
In addition to the methods shown by A, B, C, and D, 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 chimney connector through a combustible wall
for a connection to a masonry chimney.
If the chimney connector does not have to pass through a combustible wall to get to a masonry chimney, simply connect the chimney
connector directly to the masonry chimney's chimney thimble as described and shown by parts C and D of Figure 8. Remember,
the chimney connector should extend into the chimney thimble to the inner face of the chimney fl ue but not beyond; if the chimney
connector is extended through the chimney thimble into the chimney fl ue, resistance to the fl ow of smoke and gases up the chimney
will occur; that fl ow resistance will have an adverse aff ect on the operation and performance of the heater and venting system.
SHEET STEEL SUPPORTS
CHIMNEY SECTION
CHIMNEY
CONNECTOR
AIR SPACE
2 IN.
PART D
FIGURE 8
CHIMNEY CONNECTOR
TO HEATER
SOLID INSULATED, LISTED
FACTORY-BUILT CHIMNEY
LENGTH (12 IN. LONG MIN.)
MINIMUM CLEARANCE
2 IN. ALL AROUND
CHIMNEY THIMBLE 1 IN. AIR SPACE TO
CHIMNEY LENGTH
MASONRY CHIMNEY CONSTRUCTED
TO NFPA 211
SHEET STEEL SUPPORTS
(24 GAUGE MIN. THICKNESS)
CHIMNEY FLUE
MINIMUM CHIMNEY CLEARANCES FROM MASONRY TO
SHEET STEEL SUPPORTS AND COMBUSTIBLES 2 IN.
Part D: Use an 8" inside diameter solid insulated listed factory-built chimney length which has 1" or more of solid insulation. T h 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 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 ther m a l
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 "
connections to facilitate removal of the chimney connector for cleaning. The chimney thimble shall be of ASTM C315 fireclay
with 5/8" minimum wall thickness, or material of 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 chimney 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.