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USSC 9
METAL PREFABRICATED CHIMNEY REQUIREMENTS
Any metal prefabricated chimney that this heater is connected to must be a Listed High Temperature Type 103-HT Factory-
Built Residential Type and Building Heating Appliance Chimney. Its interior size should be no smaller than 6 inches in
diameter or no larger than 8 inches in diameter. An undersized chimney (less than 6 inches interior diameter) will result in
poor draft and insufficient operation where as an oversized chimney (larger than 8 inches diameter) will result in poor draft
and more creosote accumulation.
When a metal prefabricated chimney is used, the manufacturer's installation instructions must be followed precisely. You
must also purchase (from the same manufacturer) and install the ceiling support package or wall pass-through and "T"
section package, firestops (when needed), insulation shield, roof flashing, storm collar, and chimney cap (with a spark
arrester if desired or where required by code). NOTE: IF THE HEATER IS BEING INSTALLED IN A MOBILE HOME, A
SPARK ARRESTER IS REQUIRED BY CODE TO BE INSTALLED WITH THE CHIMNEY CAP.
The top of the chimney should be at least three feet above the point where it comes through the roof and at least to feet
higher than any part of the roof or house within a ten foot radius. See Figure4.
A straight up chimney is best because it will draw better.
When ordering a metal prefabricated chimney, specify the type home (residential or mobile) in which the chimney will be
installed, and the method of installation which is being planned.
METAL PREFABRICATED CHIMNEY INSTALLATION
There are basically two methods of metal prefabricated chimney installation. One method is to install the chimney inside
the residence through the ceiling and the roof. The other method is to install an exterior chimney that runs up the outside
of the residence.
Figure 6 shows a metal prefabricated chimney installed inside the residence through the ceiling and roof.
Figure 7 shows an exteriorly installed metal prefabricated chimney that runs up the outside of the residence.
The components illustrated by Figures 6 and 7 may not look exactly like the system you purchased, but they demonstrate
the basic components for a proper and safe installation.
REMEMBER: Follow the chimney manufacturer's installation instructions and maintain the manufacturer's specified clear-
ance distance.
THE CHIMNEY CONNECTOR SHALL NOT PASS THROUGH AN ATTIC, ROOF SPACE, CLOSET FLOOR CEILING, OR
SIMILAR CONCEALED SPACE. WHERE PASSAGE THROUGH A WALL OR PARTITION OF COMBUSTIBLE CON-
STRUCTION IS DESIRED, THE INSTALLATION MUST CONFORM WITH CAN/CSA-B365.