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May,
2015
Chimneys shorter than 14 feet (4.27 m) may not provide
adequate draft. Inadequate draft can result in smoke
spillage when loading the stove, or when the door is
open. Poor draft can also cause back puffing (ignition
of gas build-up inside the firebox) and sluggish
performance. The minimum height does not, in itself,
guarantee proper chimney performance.
Excessive chimney height can promote over-strong
draft resulting in high stove temperatures and short
burn times. Excessive draft can be corrected by
installing a butterfly damper. Your Jøtul dealer is an
expert resource to consult regarding draft issues or
other performance-related questions.
Wall Pass-Throughs
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
Figure 5
. 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” x 31” (78.7 x 78.7 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 ½
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” x 43” (109.2 x
109.2) square.
Locate the pass-through at least 18” from combustible
ceiling materials.
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.
Figure 5.
Masonry Wall Pass-through.
12”
30.5 cm
Header
Flue Liner
Wood Stud 2”
Clearance to
Chimney
Pass through
construction:
12” Brick from
thimble to
combustibles
12”
Sill / Support
Thimble: 5/8”
Fireclay Liner or
equivalent
