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2. THIMBLE:
An approved thimble must be used
when the connection from the stove is
made through a combustible wall to a
masonry chimney. There are several
methods you can use for connection
through a combustible wall, two of
which are illustrated in this manual. For
additional methods, consult local build-
ing authorities or use the standards set
forth in NFPA 211.
Also, listed prefabricated metal
thimbles are available for use with
wood stoves. The manufacturers in-
stallation for the thimbles must be
strictly followed to assure the safety of
the system. Be sure to maintain the
designated clearances to combustible
materials.
A. BRICK CHIMNEY THIMBLE
ASSEMBLY:
Construction of the brick thimble as-
sembly requires 12" (305mm) of
brick around a fire clay liner. Be sure
the point of penetration allows an 18"
FIGURE 11
Chimney
Wall
(457mm) clearance from the connector to the ceil-
ing. For a 6" (152mm) chimney connector, an open-
ing of 30" (762mm) must be cut in the wall to main-
tain the required 12" (305mm) of brick separation
from combustibles. It will be necessary to cut wall
studs and install a header and sill frame to main-
tain proper dimensions and to hold the weight of
the brick (Figure 11).