Prefabricated Chimneys; Chimney Height; Wall Pass-Throughs - Jøtul F 500 Oslo Installation And Operating Instructions Manual

• The masonry chimney must have a fireclay liner or equivalent,
with a minimum thickness of 5/8" (16mm) and must be
installed with refractory mortar. There must be at least 1/4"
(6,35mm) air space between the flue liner and chimney wall.
• The fireclay flue liner must have a nominal size of 8" X 8", and
should not be larger than 8" X 12". If a round fireclay liner is
to be used it must have a minimum inside diameter of 6"
(157mm) and not larger than 8" (208mm) in diameter.
• If a chimney with larger dimensions is to be used, it should
be relined with an appropriate liner that is code approved.
• The masonry wall of the chimney, if brick or modular block,
must be a minimum of 4"(106mm) nominal thickness. A
mountain or rubble stone wall must be at least 12" (310mm)
thick.
• A newly-built chimney must conform to local codes and in
their absence must recognize national regulations. W h e n
using an existing chimney, it must be inspected by a licensed
professional chimney sweep, fire official, or code officer, to
ensure that the chimney is in proper working order.
• No other appliance can be vented into the same flue.
• An airtight clean-out door should be located at the base of
the chimney.

2.3 Prefabricated Chimneys

If a prefabricated metal chimney is to be used it must be a
chimney type that is tested and listed for use with solid fuel
burning appliances.
That means a chimney that is tested to the following:
High Temperature (HT) Chimney Standard UL 103 for the U.S. and
High Temperature Standard ULC S-629 for Canada.
The manufacturer's installation instructions must be followed
precisely. Always maintain the proper clearance to combustibles
as established by the pipe manufacturer. This clearance is usually
a minimum of 2" (56mm), although it may vary by manufacturer
or for certain chimney components.

2.4 Chimney Height

The minimum chimney height is 15 feet (4.57 m). The chimney
must also be at least 3 feet higher than the highest point where
it passes through the roof and at least 2 feet higher than the
highest part of the roof or structure that is within 10 feet of the
chimney, measured horizontally. See figure 3.
Chimneys shorter than 14 feet may not provide adequate draft.
This could result in smoke spilling into the room from the stove
when loading the stove, or when the door is open. In addition,
inadequate draft can cause back puffing, which is a build up of
gases inside the firebox.
Other times, chimney height can create excessive draft which can
cause high stove temperatures and short burn times. Excessive
drafts can be corrected by installing a butterfly damper. If you
suspect you have a draft problem, consult your dealer.

2.5 Wall Pass-throughs

When your installation unavoidably requires the chimney
connector to pass through a combustible wall to reach the
chimney, always consult your local building officials, and be sure
any materials to be used have been tested and listed for 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:
• When passing through a combustible wall to a masonry
chimney this method requires the removal of all combustible
materials from at least 12" (310mm) around the chimney
connectors proposed location. With a 6" (157mm)round liner
the minimum area required would be 31" x 31" (792x792mm)
square.
• The space is then filled with at least 12" (310mm)of brick around
a fireclay liner. Remember, the liner must be ASTM C35 or
equivalent, with a minimum wall thickness of 5/8" (16mm).
• It is important to remember to locate the pass-through at
least 18"(457mm) from the ceiling for proper clearance to
combustibles.
• 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 1/4 " (83mm) thick (4" (106mm) nominal).
• 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, the tiles can shatter easily. See figure 4.
In Canada
In Canada the standard has been established by the Canadian
Standard Association. 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" (457mm) around the chimney connector's
proposed location. With a 6" (157mm) round liner the minimum
area required would be 43" x 43" square (1092x1092mm).
It is important to remember to locate the pass-through at least
18" (457mm) from the ceiling to maintain the proper clearance
to combustibles.
The space that is cleared of combustible materials must then
remain empty. Sheet metal panels can then 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"(25,4mm) from the wall. If one panel of sheet metal is to be
used it may be installed flush to the wall.
139681_R00 F 500 CB Oslo May, 2015
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