Version 1.03
April 2011
Chinook CBT
Page 17
G:\pubdata\Manuals\English Manuals\OM-CK24
OM CK24C/CK24F
THIMBLE
A thimble must be used when the connection from the stove is made
through a combustible wall to a masonry chimney. There are several
methods to use for connection through a combustible wall, two of which
are illustrated in this manual. Local building authorities may be consulted
or NFPA 211 may be used for additional methods of chimney
connection.
Also, listed prefabricated metal thimbles may be purchased for use with
wood stoves. The manufacturer's installation instructions for the thimbles
must be strictly followed to assure the safety of the system. Be sure to
maintain the designated clearance to combustible materials.
BRICK CHIMNEY THIMBLE ASSEMBLY
Construction of the brick thimble assembly requires 12 inches of
brick around a fire clay liner. Be sure the point of penetration
allows an 18 inch clearance from the connector to the ceiling. An
appropriate opening for a chimney connector must be cut in the
wall to maintain the required 12 inches of brick separation from
combustibles. It will be necessary to cut wall studs and install a
header and sill frame to maintain proper dimensions and to hold
the weight of the brick (Fig. 13). NOTE: Whenever cutting
through a wall, check first with local building authorities to be
sure building integrity is maintained. Minimum 3 1/2-inch (4-inch
nominal) thick solid bricks are to be used. The fire clay liner
(ASTM C35 or equivalent), minimum 5/8 inch 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 to the chimney liner (Fig. 14). After the assembly is
complete, insert the chimney connector in the fire clay liner. Do
not push it beyond the inside edge of the chimney liner because
this will affect the draw of the chimney.
Fig. 11 Clearances—Masonry To Combustibles
Fig. 12 Minimum Chimney Height
12"
Fig. 13 Brick Chimney Thimble
INSTALLATION INSTRUCTIONS - VENTING
