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Vermont Castings Madison
Masonry Chimneys, cont'd.
• Unused openings in an existing masonry chimney
must be sealed with masonry to the thickness of the
chimney wall, and the chimney liner should be
repaired. Openings sealed with pie plates or
wallpaper are a hazard and should be sealed with
mortar or refractory cement. In the event of a
chimney fire, flames and smoke may be forced out
of these unused thimbles.
• The chimney should be thoroughly cleaned before use.
• A newly-built masonry chimney must conform to the
standards of local building code, or, in the absence
of a local code, to a recognized national code.
Masonry chimneys must be lined, either with code-
approved masonry or precast refractory tiles,
stainless steel pipe, or a code-approved, "poured-in-
place" liner. The chimney clean-out door must seal
tightly to ensure a good draft.
Prefabricated Chimneys
A prefabricated metal chimney must be one that is
tested and listed for use with solid-fuel burning appli-
ances to the High-Temperature (H.T.) Chimney Stan-
dard UL-103-1985 (2100° F.) for the United States, and
High Temperature (650°C) Standard ULC S-629 for
Canada.
Chimney Size
This Madison is approved for venting into a masonry
chimney with a nominal flue size of 8" x 8" (200 x 200
mm), and into a round flue size of 8" (200 mm) or 6" (150
mm). It may be vented into larger chimneys as well,
however, chimneys with liners larger than 8" x 12" (200
x 300 mm) may experience rapid cooling of smoke and
reduction in draft, especially if they are located outside
the home. Such large chimneys may need to be
insulated or relined for proper stove performance.
Chimney Connector Guidelines
A chimney connector is the double-wall or single-
wall pipe that connects the stove to the chimney. The
chimney itself is a masonry or prefabricated structure
that encloses the flue. Chimney connectors are used
only to make the connection from the stove to the
chimney. They are for interior use only.
Double-wall connectors must be tested and listed
for use with solid-fuel burning appliances. Single-wall
connectors should be made of 24 gauge or heavier
steel, and should be 6" (150 mm) in diameter. Do not
use galvanized chimney connector; it cannot withstand
the high temperatures that can be reached by smoke
and exhaust gases, and may release toxic fumes
under high heat.
If possible, do not pass the chimney connector
through a combustible
wall or ceiling. If
passage through a
combustible wall is
unavoidable, refer to
the recommendations
in the section following
on Wall Pass-
throughs. Do not pass
the connector through
an attic, a closet or
any similar concealed
space. The whole
chimney connector
should be exposed and
accessible for inspection and cleaning.
Install the single wall chimney connector not less
than 23" (585 mm) from the ceiling. Keep it as short
and direct as possible, with no more than two 90
degree turns. If possible, use 45 degree elbows. Slope
horizontal runs of connectors upward 1/4" per foot (20
mm per meter) going from the stove toward the
chimney. The recommended maximum length of a
horizontal run is 3 feet (1 meter), and the total length of
chimney connector should be no longer than 8 feet (2.5
meters).
In cathedral ceiling installations, extend the prefab-
ricated chimney downward to within 8 feet (2.5 meters)
of the stove.
SAFETY NOTE: ALWAYS WEAR GLOVES AND
PROTECTIVE EYEWEAR WHEN DRILLING,
CUTTING OR JOINING CHIMNEY CONNECTOR
SECTIONS .
Flue gas
direction
Toward
stove
Fig. 4 Chimney connector.
ST242
DO NOT CONNECT THIS UNIT TO A CHIMNEY
FLUE SERVING ANOTHER APPLIANCE.
NOTE: DO NOT VENT THIS STOVE INTO A
FACTORY-BUILT (ZERO-CLEARANCE) FIRE-
PLACE. THIS STOVE HAS NOT BEEN TESTED
AND LISTED FOR THAT TYPE OF INSTALLA-
TION. FACTORY-BUILT FIREPLACES AND
THEIR CHIMNEYS ARE SPECIFICALLY DE-
SIGNED AS A UNIT FOR USE AS FIREPLACES.
IT MAY VOID THE LISTING OR BE HAZARDOUS
TO ADAPT THEM FOR ANY OTHER USE.
DO NOT CONNECT THE STOVE TO ANY AIR
DISTRIBUTION DUCT OR SYSTEM.