Osburn OB02401 - Manual (Page 5)

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1.2 Venting requirements
The flue is a critical component to a satisfactory installation. Your insert will attain its best
performance if installed with a flue that generates its own draft. The minimum venting requirement
will be the installation of a flue connector from the insert into the first tile of the chimney. If you are
using a masonry chimney, it is important that it be built in compliance with the specifications of the
National Building Code or other applicable standard having jurisdiction. It must be lined with fire clay
bricks, metal or clay tiles sealed together with fire cement (round flues are the most efficient). Ideally,
the interior diameter of the masonry chimney should be identical to the insert smoke exhaust. You
may also run a stainless steel liner inside the masonry chimney. A continuous 6" (152mm) stainless
steel liner from the top of the chimney to the insert’s smoke exhaust is the optimum system and will
provide the best performance, as well as compensate for poor draft situations caused by large
cross-sectional chimneys. The insert will not work without a positive seal in the chimney.
Chimneys constructed outside of the home, on an exterior wall, should be avoided if possible,
especially in colder climates. Outside chimneys may not draw as well and may downdraft due to the
difficulty in heating them up to operating temperature. Cooler chimneys will result in increased
creosoting, less draft, and poorer performance. Draft is proportional to overall chimney height as
well as to stack temperature. Draft can be increased by increasing chimney height, and by reducing
heat loss from the chimney through an insulated liner.
Ensure that all joints in the flue systems are tightly sealed, since any leaks will result in reduced
performance as well as a possible safety hazard. Using a fire screen at the extremity of the chimney
requires regular inspection in order to insure that it is not obstructed thus blocking the draught, and it
should be cleaned when necessary.
Do not connect this unit to a chimney flue serving another appliance.
This heating unit must serve as a supplementary heat source. An alternate heat source should be
available in the home if needed. The manufacturer cannot be responsible for additional heating
costs associated with the use of an alternative heat source.
It is recommended that the user buys this product from a retailer who can provide installation and
maintenance advices.