Energy Distribution 2015 REVISION JULY 2020
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benefit from the warmth of the building, so it typically
operates at lower flue temperatures than an interior
chimney and may experience increased creosote
accumulation.
When connecting the Invicta to a prefabricated metal
chimney, you must follow, precisely, the
manufacturer's installation instructions. Use only Type
HT (2100° F), prefabricated metal chimneys listed per
UL 103 or ULC S629 standards.
Ensure the size of the prefabricated chimney’s flue is
appropriate for the Invicta stove. This Invicta series
requires a 7" (178 mm) inside diameter flue for new
installations. A 7” diameter flue provides adequate
draft and performance. You can use an 8" (203 mm)
diameter existing flue with a reducer. An oversized
flue contributes to creosote accumulation. (In this
case, bigger is NOT better.)
When purchasing a prefabricated chimney to install
with your stove, ensure you also purchase from the
same manufacturer the wall pass-through (or ceiling
support package), "T" section package, fire-stops
(when needed), insulation shield, roof flashing,
chimney cap, and any other required accessories.
Follow the manufacturer’s instructions when installing
the chimney and accessories. In addition, ensure you
maintain all manufacturers’ recommendations for the
proper clearances to the chimney.
Connection to a Masonry Chimney
Consider two primary elements when connecting your
stove to a masonry chimney: the chimney itself and
the thimble where the stovepipe connects to the
chimney. Use only code approved masonry
chimneys containing a proper flue liner.
Before connecting to a masonry chimney, hire a
professional to examine the chimney for cracks, loose
mortar, and other signs of deterioration and blockage.
If the chimney needs repair, complete them before
installing and using your stove. Do not install your
stove until the chimney is safe for use.
Ensure the chimney’s cleanout is complete and
working properly. To avoid a loss of draft, the cleanout
door must close completely and provide a tight seal. If
the cleanout door leaks, the chimney will cool, your
stove will perform poorly, and creosote can form.
Ensure the size of the chimney’s flue is appropriate for
this stove and that it is not too large. Use a masonry
chimney with a maximum 7” Diameter or 8" x 8" (203
mm x 203 mm) tile size for best results. An oversized
flue contributes to the accumulation of creosote.
Use the following checklist to ensure that your
masonry chimney meets these minimum
requirements:
MASONRY CHIMNEY WALL CONSTRUCTION :
• Mortared brick or modular block at least 4" (102
mm) thick – must use liner
• A mortared rubble or stone wall – must use liner
FLUE LINER OPTIONS :
• Tile - minimum wall thickness of 5/8" (16 mm),
installed with refractory mortar, and with at least
1" (25 mm) air space around the liner
• Stainless steel - UL listed 7” diameter, insulated
or wrapped liner, or the space around the liner
filled with vermiculite or suitable material (these
keep the liner warmer for better performance)
• Ensure any equivalent flue liner is a listed
chimney liner system meeting type HT
requirements or other approved material.
INTERIOR CHIMNEY REQUIREMENTS :
• Must have at least 2" (51 mm) clearance to
combustible materials
• Must install fire stops at the spaces where the
chimney passes through floors and/or ceiling
• Any insulation material must be at least 2" (51
mm) from the chimney
EXTERIOR CHIMNEY REQUIREMENTS :
• At least 1" (25 mm) clearance to combustible
materials
CHIMNEY HEIGHT REQUIREMENTS (SEE FIGURE 9):
• At least 3 feet (0.9 m) higher than the highest part
of the roof opening through which it passes.
• At least 2 feet (0.6 m) higher than any part of the
roof within 10 feet (3 m) measured horizontally
from the top of the chimney.
The recommended minimum chimney height is 15
feet (4.5 m) off the floor. The recommended
maximum chimney height is 45 feet (13.5m). This
Invicta series requires a draft between 0.06” and 0.1”
water column. Ensure your chimney is long enough
to provide the minimum draft, and use a damper if
your installation has a required chimney height that
provides too much draft.
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