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The Combustion Air System (CAS) is a system
designed to bring in outside combustion
air directly into your wood-burning stove or
appliance, while still venting the exhaust gases
safely into a listed chimney. The CAS system
is available for the DuraPlus HTC chimney
system.
CLEARANCES
Always follow the required clearance to
combustibles for the vent or chimney system
you are installing. DuraPlus HTC chimney pipe
requires a minimum of 2" clearance to any
combustible. Never fill any required clearance
space with insulation or any other materials.
Combustible materials include, but are not
limited to, lumber, plywood, sheetrock, plaster
and lath, furniture, curtains, electrical wiring,
and building insulation. The CAS Triple-Wall
Stovepipe must have 6" clearance from walls
and combustibles (running vertically) and 8"
clearance from ceilings and combustibles
(running horizontally).
PERMITS
Contact your local Building Official or Fire
Official regarding permits, restrictions, and
installation inspections in your area.
EQUIPMENT & MATERIALS
Drill / Driver
Hammer
Caulking Gun
Plumb Bob
Screwdrivers (Phillips & Standard)
Tin Snips
Saber or Keyhole Saw
Level
Dependable Ladder
Tape Measure
Proper Gloves and Shoes
Eye Protection
4
Materials You May Need:
Non-hardening Waterproof Sealant
8-Penny Nails, 600
Roofing Nails
#8, 2-1/2" & 1-1/2" Wood Screws
INSTALLATION NOTES
Proper planning for your Combustion Air
System installation will result in greater
safety, efficiency, and convenience, as well
as saving time and money. You must use
only authorized DuraVent CAS parts and
related chimney components to maintain a
safe, approved system. Do not mix parts
or try to match with other products or use
improvised solutions. Do not install damaged
or modified parts. Practice good workmanship.
Sloppy work could jeopardize your chimney's
safety. Keep electrical wiring and building
insulation away from all chimneys. When
deciding the location of your installation, try to
avoid modifications to roof beams and other
structural components of the building. If you
have any questions, contact either your dealer
or DuraVent directly.
APPLIANCE RECOMMENDATIONS
Always follow the stove manufacturer's
installation instructions.
Installation: Install your stove or appliance as
described by the appliance manufacturer. Be
sure to maintain all required clearances.
Flues: Connect only one appliance per
chimney.
Operation: Follow the appliance safety
manual for maximum efficiency and safety. Do
not over fire the appliance. Any damage to the
appliance or chimney can possibly void your
warranties and cause a fire hazard.
Fuels: Only burn approved fuels as specified
by your appliance manufacturer's instructions.
Do not burn driftwood, plastic, or chemically
treated wood such as railroad ties. They are
corrosive to your chimney system.
F RTV Silicone Sealant
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