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Minimum 3 ½” (89mm) [4” (102mm) nominal] thick solid bricks are to be used. The fire clay liner
(ASTM C35 or equivalent), 5/8” (16mm) wall thickness, must not penetrate into the chimney beyond the
inner surface of the chimney flue liner and must be firmly cemented in place. If it is necessary to cut a
hole in the chimney liner, use extreme care to keep it from shattering. Refractory mortar must be used at
the junction with the chimney liner. After the assembly is complete, insert the chimney connector into
the fire clay liner. Do not push it beyond the inside edge of the chimney liner, as this will affect the
draw of the chimney.
B. 6” SOLID PACK CHIMNEY WITH METAL SUPPORTS AS A THIMBLE: For the method of
installation to a masonry chimney shown in Figures 10 and 11 (page 13), it will be necessary to purchase
a 6” (152mm) inside diameter, 12” (305mm) long section of prefabricated listed solid pack chimney to
use as a thimble. Purchase a wall spacer, trim collar and wall band that are manufactured to fit the
chimney section you purchase. Cut out a 14 ½” (368mm) diameter opening in the wall. It may be
necessary to cut wall studs and install a header and sill frame to maintain the wall support. The hole in
the chimney must have at least a 6” (152mm) diameter fire clay liner or equivalent, secured with
refractory mortar. If it is necessary to cut a hole in the chimney liner, use extreme care to keep it from
shattering.
The safety features of this system are the 2” (50mm) air space between the chimney section and
combustible wall, and the 1” (25mm) air space around the chimney connector as it passes through the
chimney section to the chimney. The location of the opening through the wall to the chimney must
leave a minimum 18” (457mm) vertical clearance between the connector pipe and the ceiling, to prevent
the ceiling from catching fire when using single wall pipe.
Page 12
FIGURE 9