DuraBlack Product Catalog

Specifications
Combustion Air Systems
for DuraTech and DuraPlus HTC
Applications
Triple-wall chimney system designed to
provide air for combustion through its
components. Provides a 3” air intake for
the appliance.
Materials and Construction
.016” stainless steel inner wall.
.018” galvalume middle wall.
.018” galvalume outer, painted black.
Clearances
6” clearance to walls. 8” clearance to
ceiling on horizontal pipe that runs
below the ceiling.
Diameters
6” and 8”
Listing
ULC-S641
c-UL-us
UL 1777 and ULC S641 System
Combustion Air System-DuraTech and
DuraPlus HTC
The Combustion Air System (CAS) is a system designed to bring
in outside combustion air directly to your wood or pellet stoves.
This eliminates the use of conditioned inside air for combustion,
improving the eciency of central heating systems.
Combustion Air System is a patent-pending design that pre-heats
combustion air. Inbound air is circulated through baes around
the heated areas of the support box or wall thimble. For DuraTech
and HTC, the pre-heated air is supplied between the stove
pipe’s 2nd and 3rd wall, while the 1st wall maintains high stove
temperatures.
CAS enables outside air to be used as combustion air below
grade. The wall thimbles for both wood and pellet stoves provide
combustion air to appliances used in below grade (basement)
installations. Wood stoves utilize the triple wall stove pipe. Pellet
stoves utilize the adjustable air channel. CAS also minimizes down-
drafts in below grade installations. It does not consume warm
indoor air for combustion and not subject to oxygen starvation,
poor draft and other problems associated with ‘tight’ energy
ecient homes.
This system simplies installation with only one wall or ceiling
penetration, eliminating the need for a second penetration in
the building envelope to introduce combustion air. The design is
simple and elegant with decorative black nish. All products are
factory nished in matte black.
DuraVent | www.duravent.com
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