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Vermont Castings Defiant
What Kind of Chimney to Use
You must connect the Defiant to a code-approved
masonry 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. Fig. 2 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
ST241
Fig. 2 Approved chimney types.
The chimney must extend at least 3' (900 mm)
above the highest point where it passes through or
past a roof, and at least 2' (600 mm) higher than any
part of a building within 10' (3 m) horizontally. (Fig. 3)
For proper draft and good performance, any
chimney used with a Defiant should extend at least 16
feet (5 m) above the flue collar of the stove.
2' Min.
2' Min.
3'
Min.
0 TO 10'
3'
Min.
0 TO 10'
Reference
Point
AC617
Fig. 3 The 2’-3’10’ Chimney Rule.
Masonry Chimneys
An inspection of the chimney must confirm that it has a
lining. Do not use an unlined chimney. The chimney
must have no cracks, loose mortar, other signs of
deterioration, or blockage. Repair any defects before
using the chimney with your stove.
Seal any unused openings in an existing masonry
chimney with masonry to the thickness of the chimney
wall, and repair the chimney liner. Openings sealed
with pie plates or wallpaper are a hazard and must be
sealed with mortar or refractory cement. In 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 to
the stove, 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
The Defiant is approved for venting into a masonry
chimney with a nominal flue size of 8" x 8" (200 x 200
mm) or 8" x 12" (200 x 300 mm), and into a round flue
with nominal flue size of 8" (200 mm). A Defiant with a
6" (150 mm) flue collar adapter 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 with nominal
flue size of 6" (150 mm).
NOTE: When installed with a 6" flue collar
adapter, the Defiant may not be operated with the
front doors open.
Whatever the flue collar size, a Defiant may be
vented into larger chimneys as well. However, chim-
neys with liners larger than 8" x 12" (200 x 300 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.