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FIGURE 33: SHEET STEEL CHIMNEY CONNECTOR, VENTILATED THIMBLE
Sheet steel chimney connectors must be made from material that is a minimum of 24 gauge in thickness and is separated
by two, one-inch air channels. The outside of the air channel must be separated from combustible materials by a
minimum of six inches of glass fiber insulation. The wall opening shall be covered and the thimble will be supported with
sheet steel supports that are made from material at least 24 gauge in thickness.
FIGURE 34: TYPE HT 2100ºFACTORY-BUILT CHIMNEY
Installations that use type HT 2100º listed factory-built chimney require an inside diameter two inches larger than the
chimney connector. This listed chimney must have at least one inch or more insulation that serves as a pass-through for a
single-wall sheet steel chimney connector that is a minimum 24-gauge thick and with a minimum two-inch air space
between the outer wall of chimney section and any combustibles. The minimum length of the chimney section must be
twelve inches and that chimney section will be spaced one inch away from the connector using sheet steel support plates
at both ends of chimney section. Cover the opening and support the chimney section on both sides with sheet steel
brackets that are a minimum of 24-gauge thickness. Securely fasten these brackets to the wall surfaces. Any fasteners
used to secure the chimney section shall not penetrate any portion of the chimney flue liner. A minimum of three screws
per chimney connector must be used.
Summary of Contents for Catalytic BBF Series
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