Osburn 900 Installation and Operation Manual
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8
THE VENTING SYSTEM
8.1
GENERAL
The venting system, made up of the chimney and the connecting pipe between the stove and the
chimney, acts as the engine that drives your wood heating system. Even the best stove will not
function safely and efficiently as intended if it is not connected to a suitable chimney.
The heat in the flue gases that pass from the stove and chimney connector into the chimney is not
waste heat. This heat is what the chimney uses to make the draft that draws in combustion air,
keeps smoke inside the stove and safely vents exhaust to outside. You can think of heat in the flue
gas as the fuel the chimney uses to make draft.
8.2
SUITABLE CHIMNEYS
Your wood stove will provide optimum efficiency and performance when connected to a 6-inch
diameter chimney flue system. The connection to a chimney having a diameter of at least 5 inches
(Canada only) or no more than 7 inches is permitted, if it allows the proper venting of combustion
gases and that such application is verified and authorized by a qualified installer. Otherwise, the
diameter of the flue should be 6 inches.
To be suitable, a factory-built metal chimney
must comply with UL 103 HT (U.S.A.) or ULC
S629 (Canada).
8.2.1
FACTORY-BUILT METAL CHIMNEYS
These are sometimes referred to as ‘high temp’
chimneys because they have the special
characteristics to withstand the temperatures
that can be created by wood burning stoves.
Factory-built chimneys are tested as a system
with all the necessary components for
installation. The instructions provided with the
chimney by its manufacturer are the only
reliable source of installation guidelines. To be
safe and effective, the chimney must be
installed exactly in accordance with the
manufacturer’s
instructions.
Use
only
components intended for the brand and
model of chimney you are using. Never
substitute parts from other chimney brands or
fabricate your own components. The chimney
must be a type suitable for solid fuel.
