DuraTech Product Catalog

Planning Your Installation
The following recommendations are 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, found 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 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/ 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 have a 360°
swivel base to allow orientation of elbow direction only. Elbows are
xed at 15° or 30°. 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 section 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
extends 5’ or more above the roof penetration an extended roof
bracket is required. An additional roof bracket is needed every 5’.
• 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 5”-8” DuraTech
pipe, subtract 1 ¼” per joint. For 10”-24” diameter, subtract ¾” per
joint of pipe. Subtract 1 ¼” per joint of DuraBlack stovepipe. Subtract
1 ½” 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.
• For a UL approved shroud, see the DuraTech Shrouds Installation
Instructions (L157). View online at www.duravent.com, under catalogs
and instructions.
• Be re safe. Maintain at least 2” clearance to combustibles. Follow
local building codes and have your chimney inspected by a
certied professional.
Figure 1
3 FT. MIN.
ABOVE ROOF
PENETRATION
2 FT. MIN. ABOVE
HIGHEST POINT OF
THE BUILDING WITHIN 10 FT.
MINIMUM CHIMNEY HEIGHT REQUIREMENT
12”
10’
6”
All-Fuel Chimney | DuraTech
800-835-4429 | DuraVent
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