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g) Alteration of the fireplace in any manner is not permitted with the following exceptions;
i) i. external trim pieces which do not affect the operation of the fireplace may be removed
providing they can be stored on or within the fireplace for re-assembly if the insert is removed.
ii) the chimney damper may be removed to install the chimney liner.
h) Circulating air chambers (i.e. in a steel fireplace liner or metal heat circulator) shall not be blocked.
i) Means must be provided for removal of the insert to clean the chimney flue.
j) Inserts that project in front of the fireplace must be supplied with appropriate supporting means.
A permanent metal warning label must be attached to the back of the fireplace stating that the
fireplace must be restored to its original condition for safe use without the insert.
3. CHIMNEYCAPS: Mesh type chimney caps must have provision for regular cleaning, or the mesh
should be removed to eliminate the potential of plugging.
4. LINER:The chimney must have an acceptable masonry liner suitable for solid fuel, otherwise a
continuous stainless steel liner must be installed.
5. ADJACENT COMBUSTIBLES: The fireplace should be inspected to make sure that there is
adequate clearance to combustibles, both exposed combustibles to the top, side, and front as well
as concealed combustibles, in the chimney and mantel area. Your local inspector should have
information on whether older fireplaces are of adequate construction.
6. OPENING SIZE: Refer to “Suitable Fireplace Dimensions” for suitable size fireplace openings.
NOTE: A METAL TAG ISPROVIDEDANDIS TOBE FASTENED TOTHE BACKWALL
OF THE FIREPLACE, IF THE FIREPLACE HASBEEN MODIFIED TO ACCOMMODATE
THE INSERT.
1.2 Venting requirements
The flue is a critical component to a satisfactory installation. Your Osburn insert will attain its best
performance if installed with a chimney that generates its own draft. The minimum requirement of a
flue will be the installation of a flue connector (the liner must conformto UL1777 chimney liners) from
the insert into the first flue tile of the chimney (USA), see Figure 2.3 , or a continuous stainless steel
liner (the liner must conform to the Class 3 requirements of CAN/ULC-S635) directly connected to the
flue outlet (Canada), see Figure 2.2. A continuous 6" (152mm) stainless steel liner from the top of the
chimney 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 creosoteing, 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.
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