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Pyropak Installation and Operation Manual
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
(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.
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