American Energy Systems O2 Catalytic - Manual (Page 76)

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3 Any material used to close up an opening for the connector shall be of noncombustible material.
4 A connector to a masonry chimney, except for the installation shown in FIGURE 31, shall extend in one
continuous piece through the wall pass-through system and the chimney wall to the inner face of the flue liner, but not
beyond.
FIGURE 31: MASONRY CHIMNEY TO COMBUSTIBLE WALL
A minimum of three and one-half inch thick brick masonry chimney framed into a combustible wall with a minimum of
twelve-inch brick separation from the clay liner to combustibles is permissible. The clay liner (stove) shall run from the
outer surface of the brick wall, but not beyond the inner surface of chimney flue liner. The clay liner should be firmly
located and firmly cemented in its proper location.
FIGURE 32: TYPE HT 2100
0
FACTORY-BUILT CHIMNEY
Type HT 2100 0 factory-built chimney length that has the same inside diameter as the chimney connector. The factory-built
chimney must also have one inch or more insulation with a minimum of nine inches of airspace between the outer wall of
the chimney length and any combustibles.