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4.2.2 Wall Pass-Throughs
Note: In addition to the methods described here, any
listed, prefabricated wall pass-through components
available from chimney manufacturers may be used.
In the U.S.
The National Fire Protection Association's publication,
NFPA 211, Standard for Chimneys, Fireplaces, Vents and Solid
Fuel Burning Appliances permits four methods for passing
through a combustible wall. Before proceeding with any
method be sure to consult with your local building officials
to discuss any local code requirements.
Common Method:
See fig. 6 Remove all combustible materials from the
pass-through area ( around the chimney connector), a
minimum 12" (30.5 cm). A 6" (15.2 cm) diameter connector
will require a 31 1/4" x 31 1/4" (79.4 x 79.4 cm) square
opening.
The opening must be filled with at least 12" (30.5 cm)
of brick around a fireclay liner. The liner must be ASTM
C35 or equivalent, having a minimum wall thickness of 5/8"
(16 mm).
The Pass-through must be at least 18" (45.7 cm) from
combustible ceiling materials.
It will be necessary to cut wall studs, install headers,
and construct a sill frame to maintain the proper
dimensions and to support the weight of the brick.
The bricks must be solid brick with a minimum of 3
inches thick (nominal 4"/ 102 mm).
Refractory mortar must be used at the junction
of the chimney and the pass-through liner. The pass-
through liner must not penetrate the chimney liner
beyond the inner surface of the chimney liner. Use
extreme care when constructing the hole in the chimney
liner as the tiles can shatter easily.
In Canada
The installation must conform to CAN/CSA-B365,
Installation Code for Solid Fuel Burning Appliances and
Equipment. Before proceeding be sure to consult your
local building inspector.
Common Method:
This method requires the removal of all combustible
materials from at least 18" (45.7 cm) around the chimney
connector's proposed location. A 6" round liner requires
a minimum opening 43 1/4" x 43 1/4" (109.8 x 109.8cm)
square.
Locate the pass-through at least 18" from
combustible ceiling materials.
Jøtul F 370 US/CAN 10036803_P14
Clearance
2"
to
Chimney
Wall
12"
Minimum
clearance
between
thimble and
combustible
framing
12"
Sill/Support
Figure 6.
Chimney connection to masonry chimney.
The space that is cleared of combustible materials
must remain empty. Sheet metal panels can be used
to cover the area. However, when using a panel on
both sides of the wall, each cover must be installed on
noncombustible spacers at least 1" from the wall. If one
panel of sheet metal is to be used it may be installed
flush to the wall.
See section 5.3.1 and 5.3.2 of CAN/CSA - B365-M91.
Consult your local building inspector, authorized Jøtul
Dealer, NFPA 211 in the U.S. or CAN/CSA-B635 in Canada
for other approved wall pass-through methods.
Flue Liner
Chimney
Wall
9
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