5
Dutchwest Seneca
2006063
Prefabricated Chimneys
A prefabricated metal chimney must be one tested and
listed for use with solid-fuel burning appliances to the
High-Temperature (H.T.) chimney Standard UL-103-
1985 (2100
°
F.) for the United States, and High Tem-
perature (650
°
C) Standard ULC S-629 for Canada.
Chimney Height
For proper draft and good performance, the chimney
should extend at least 16' (5m) above the flue collar of
the stove.
The chimney must also extend at least 3' (900 mm)
above the highest point where it passes through a roof,
and at least 2' (600mm) higher than any portion of a
building within 10' (3m). (Fig. 3)
Chimney Size
A Seneca is approved for venting into a masonry
chimney with a nominal flue size of 8” x 8” (200 x
200mm), and into a round flue size of 8” (200mm).
It may vented into larger chimneys as well. However,
chimneys with liners larger than 8” x 12” (200 x 300mm)
my experience rapid cooling of smoke and reduction in
draft, especially if these chimneys are located on the
home’s exterior. These large chimneys may need to be
insulated or may need to have their flues relined for
proper stove performance.
Accessories to help make the connection between
stainless steel chimney liners and the stove are avail-
able through your local dealer.
Chimney Connector Guidelines
The chimney connector is the 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.
Do not pass the chimney connector through a combus-
tible wall or ceiling, or through an attic, a closet or any
similar concealed space. If passage through a combus-
tible wall is unavoidable, follow the recommendations in
the following section on Wall Pass-Throughs.
The single-wall chimney connector should be made of
24 gauge or heavier steel, and may be either 6”
(150mm) or 8” (200mm) in diameter.
Install the chimney connector not less than 18" (450
mm) from the ceiling. Keep the passage as short and
direct as possible, with no more than two 90 degree
turns. Slope horizontal runs of connectors upward 1/4”
per foot (20mm per meter) going from the stove toward
the chimney. The recommended maximum length of
horizontal run is 3 feet (1m), and the total length of
chimney connector should be no longer than 8 feet
(2.5m).
In cathedral ceiling installations, extend the prefabri-
cated chimney downward to within 8 feet (2.5 meters) of
the stove. The entire chimney connector should be
exposed and accessible for inspection and cleaning.
Do not use galvanized chimney connector; it cannot
withstand the high temperatures that can be reached by
smoke and exhaust gases and it may release toxic
fumes under high heat.
Assembling the Chimney Connector
SAFETY NOTE: Always wear gloves and safety
goggles when drilling, cutting or joining sections of
chimney connector.
•
Beginning at the flue collar of the stove, assemble
the chimney connector. Insert the first crimped end
into the stove’s flue collar, and keep each crimped
end pointing toward the stove. Using the holes in the
flue collar as guides, drill 1/8” (3m) holes in the
bottom of the first section of chimney connector and
DO NOT CONNECT THIS UNIT TO A CHIMNEY
FLUE SERVING ANOTHER APPLIANCE.
WARNING: Do not use double-wall chimney con-
nectors with the Seneca unless they have been
specifically tested and listed for use with this
appliance. Use of double-wall chimney connectors
that have not been tested and listed for use with the
Seneca may result in temperatures exceeding the
limits established by the test standards ANSI/UL-
1482 or ULC S627. A potential hazard may result,
including a house fire.
2’ Min.
2’ Min.
3’
Min.
0 To 10’
3’
Min.
0 To 10’
AC617
Fig. 3 The 2/3/10 rule for chimneys.
Reference
Point