What Kind Of Chimney To Use; Masonry Chimneys; Prefabricated Chimneys; Approved Chimney Types - Vermont Castings 1975 Owner's Manual

Defiant FlexBurn 1975 Non-Catalytic / Catalytic Wood Burning Stove
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What Kind of Chimney to Use

You must connect the Defiant
chimney with a flue liner, to a relined masonry chimney that
meets local codes, or to a prefabricated metal chimney that
complies with the requirements for Type HT chimneys in the
Standard for Chimneys, Factory-Built, Residential Type and
Building Heating Appliance, UL 103. Figure 3 illustrates the
two types. The chimney and chimney connector must be in
good condition and kept clean.
If you use an existing masonry chimney, it must be inspected
to ensure it is in a safe condition before the stove is installed.
Your local professional chimney sweep, building inspector, or
fire department official will be able to inspect the chimney or
provide a referral to someone who can. See "Chimney and
Fireplace hazards", in the appendix, for particulars.
A prefabricated double-
wall insulated chimney
A tile-lined
masonry chimney
Figure 3 - Approved chimney types.
The chimney must extend at least 3' (914 mm) above the
highest point where it passes through or near a roof, and at
least 2' (610 mm) higher than any part of a building within
chimney types
10' (3 m) horizontally. (Figure 4)
12/13/99 djt
For proper draft and good performance, any chimney used
with a Defiant should extend at least 16' (5 m) above the
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flue collar of the stove.
0 To 10'
2' Min.
3'
Min.
Reference
Point
Figure 4 - The 2'-3'10' Chimney Rule.
AC617
RLTSKC8
2/11/98
6
to a code-approved masonry
®
ST241
0 To 10'
2' Min.
3'
Min.
Vermont Castings • Defiant Flexburn Installation & Operating Manual_R32 • 04/17

Masonry Chimneys

An inspection of the chimney must confirm that it has a lining.
Do not use an unlined chimney. The chimney should have
no cracks, loose mortar, other signs of deterioration, and
blockage. Repair any defects before the chimney is used
with your stove.
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 your 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 pre-cast
refractory tiles, stainless steel pipe, or a code-approved,
"poured-in-place" liner. The chimney's clean-out door must
seal tightly. A loose or leaky clean-out door can weaken
chimney draft, causing performance problems.

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 Temperature (650°C) Standard
ULC S-629 for Canada.
DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE
SERVING ANOTHER APPLIANCE.
Chimney Size
A Defiant with an 8" (203 mm) flue collar is approved for
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venting into a masonry chimney with a nominal flue size of
8" x 8" (203 x 203 mm) or 8" x 12" (203 x 305 mm), and into
a round flue with nominal flue size of 8" (203 mm). A Defiant
with a 6" (152 mm) flue connector is approved for venting
into a masonry chimney with a nominal flue size of 8" x 8"
(203 x 203 mm), and into a round flue with nominal flue of
6" (152 mm).
NOTE: When installed with a 6" flue collar, the Defiant
may not be operated with the front doors open.
Whatever the flue collar size, a Defiant
larger chimneys as well. However, chimneys with liners larger
than 8" x 12" (203 x 305 mm) may experience rapid cooling
of smoke and reduction in draft, especially if the chimneys
are located outside the home. These large chimneys may
need to be insulated or have their flues relined for proper
stove performance.
Accessories to help make the connection between stainless
steel chimney liners and your Defiant
your local dealer.
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may be vented into
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are available through
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3-90-30005220