DuraPlus Product Catalog

Planning Your Installation
10'
3 FT. MINIMUM
HEIGHT FROM
ROOF PENETRATION
2 FT. MINIMUM ABOVE
ANY PORTION OF BUILDING
WITHIN 10 FT.
MINIMUM CHIMNEY HEIGHT REQUIREMENT
The following recommendations are a general guideline to
assist in the layout and selection of the chimney components
needed for your installation. Always follow DuraVent Installation
instructions before installing your chimney system(enclosed with
the cap or support box). Installation instructions can be viewed
online at www.duravent.com, under catalogs and instructions.
• The diameter of the chimney should match the outlet size of
the appliance. An improperly sized chimney results in poor draft
and excessive creosote formation.
• Measure the diameter of the appliance ue outlet. Select the
chimney and either DVL or DuraBlack connector stovepipe with
the same size diameter as the appliance ue outlet. For replace
installations, refer to the sizing chart in the back of the DuraTech
section of this catalog.
• Determine if the installation is a through-the-roof installation or
a through-the-wall installation. A through-the-wall installation
will require additional components (Wall Thimble, Tee w/ Cap,
Tee Support, and Wall Straps).
• Install the chimney in the interior of the structure whenever
possible. A cold exterior chimney will produce less draft and will
generate more creosote.
• If possible, avoid osets that serve to restrict the natural draft.
A straight vertical installation is more ecient and less likely to
develop creosote. If an oset is required to avoid rafters or other
obstructions, measure the horizontal distance required and the
vertical height available. Both 15° and 30° elbows are available.
Elbows greater than 30° are not allowed in the United States. A
maximum of two osets in a single installation are permitted.
Refer to the oset table in the back of this catalog. At least one
Elbow Strap is required for each oset. Elbow Straps ensure
adequate support.
• Determine the minimum chimney height above the roof
line. Building codes require a minimum of 3’ above the roof
penetration and at least 2’ higher than any portion of a building
within 10’. See gure 1. The termination cap is installed above
that point. If chimney is more than 4’ above the roof penetration
an Extended Roof Bracket is required.
• Measure the roof pitch. For example, a 6/12 pitch has a vertical
rise of 6” over a horizontal distance of 12”. Select the
appropriate ashing.
• Determine the total length of chimney and stovepipe required
for the installation. To calculate the installed per length of
6”-8” DuraPlus chimney pipe, subtract 1 ⁄” per joint. Subtract
1 ⁄” per joint of DuraBlack stovepipe. Subtract 1 ⁄” per joint
of DVL stovepipe. Minimum chimney height, at sea level of
straight vertical chimney is 10’ to 15’ above the appliance outlet.
Higher elevations, or the use of elbows or a tee, will require
approximately 30% to 60% more height to provide for an
adequate draft.
• Be re safe. Maintain at least 2” clearance to combustibles.
Follow local building codes and have your chimney inspected by
a certied professional.
DuraPlus | All-Fuel Chimney
DuraVent | www.duravent.com
47
Figure 1