803.10.4 Connector Pass-Through
Chimney connectors shall not pass through any floor or ceiling, nor through a fire-resistance-rated wall assembly. Chimney connectors for domestic-type appliances shall not pass through walls or partitions constructed of combustible material to reach a masonry chimney except where one of the following apply:
- The connector is labeled for wall pass-through and is installed in accordance with the manufacturer's instructions.
- The connector is put through a device labeled for wall pass-through.
- The connector has a diameter not larger than 10 inches (254 mm) and is installed in accordance with one of the methods in Table 803.10.4. Concealed metal parts of the pass-through system in contact with flue gases shall be of stainless steel or equivalent material that resists corrosion, softening or cracking up to 1,800°F (980°C).
A 3.5-inch-thick brick wall shall be framed into the
combustible wall. An 0.625-inch-thick fire-clay liner
(ASTM C 315 or equivalent)e shall be firmly cemented
in the center of the brick wall maintaining a 12-inch
clearance to combustibles. The clay liner shall run
from the outer surface of the bricks to the inner surfaceof the chimney liner.
(1-inch insulation) the same inside diameter as the
connector shall be utilized. Sheet steel supports cut to
maintain a 9-inch clearance to combustibles shall be
fastened to the wall surface and to the chimney section.
liner. The chimney length shall be flush with the
masonry chimney liner and sealed to the masonry with
water-insoluble refractory cement. Chimney manufacturers'
parts shall be utilized to securely fasten thechimney connector to the chimney section.
A steel ventilated thimble having a minimum thickness
of 0.0236 inch (No. 24 gage) having two 1-inch
air channels shall be installed with a steel chimney
connector. Steel supports shall be cut to maintain a 6-inch
clearance between the thimble and combustibles.
The chimney connector and steel supports shall have a
minimum thickness of 0.0236 inch (No. 24 gage). One
side of the support shall be fastened to the wall on all
sides. Glass-fiber insulation shall fill the 6-inch spacebetween the thimble and the supports.
(1-inch insulation) with a diameter 2 inches larger than
the chimney connector shall be installed with a steel
chimney connector having a minimum thickness of
0.0236 inch (24 gage). Sheet steel supports shall be
positioned to maintain a 2-inch clearance to combustibles
and to hold the chimney connector to ensure that a
1-inch airspace surrounds the chimney connector
through the chimney section. The steel support shall be
fastened to the wall on all sides and the chimney section
shall be fastened to the supports. Fasteners shallnot penetrate the liner of the chimney section.
For SI: 1 inch = 25.4 mm, 1.0 Btu • in/ft2 • h • °F = 0.144 W/m2 • K.
- Insulation material that is part of the wall pass-through system shall be noncombustible and shall have a thermal conductivity of 1.0 Btu • in/ft2 • h • °F or less.
- All clearances and thicknesses are minimums.
- Materials utilized to seal penetrations for the connector shall be noncombustible.
- Connectors for all systems except System B shall extend through the wall pass-through system to the inner face of the flue liner.
- ASTM C315.