F. CONNECTION TO A METAL PREFABRICATED CHIMNEY.
When a metal prefabricated chimney is used, the manufacturer’s installation instructions must be fol-
lowed 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, chimney cap, etc. Maintain the proper clearance to the structure as recommended by
the manufacturer. This clearance is usually a minimum of 2”, although it may vary by manufacturer or
for certain components.
There are two methods of metal chimney installation. One method is to install the chimney inside the
residence through the ceiling and the roof. [See Figures 17:1 and 17:2,] The other method is to install
an exterior chimney that runs up the outside of the residence. [[See Figures 18:1 and 18:2.] The com-
ponents illustrated may not look exactly like the system you purchase, but they demonstrate the basic
components you will need for a proper and safe installation.
The chimney must be the required height above the roof or other obstruction for safety and for proper
draft operation. The requirement is that the chimney must be at least 3’ higher than the highest point
where it passes through the roof and at least 2’ higher than the highest part of the roof or structure
that is within 10’ of the chimney, measured horizontally. [See Figure 12:2, Page 12]
Remember: Follow the manufacturer’s installation instructions and maintain the manufactur-
er’s specified clearance distances.
Summary of Contents for Swatara CS-85
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