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CONNECTION TO A METAL PREFABRICATED CHIMNEY
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 (where 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” (50mm), although it may vary by manufacturer or for certain components.
There are basically two methods of metal chimney installation. One method is to install the chimney inside the
residence through the ceiling and the roof (Figure 12). The other method is to install an exterior chimney that
runs up the outside of the residence (Figure 13). This method of installation requires at a minimum a wall pass-
through device, a wall support package, insulated “T” section and roof flashing. The components 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 proper draft
operation. The chimney must be a minimum of 3’ (914mm) higher than the highest point where it passes
through the roof, and at least 2’ (610mm) higher than the highest part of the roof or structure that is within 10’
(3048mm) of the chimney, measured horizontally (Figure 5, on page 9).
REMEMBER: Follow the manufacturer’s installation instructions and maintain the manufacturer’s specified
clearance distances.
Page 14
FIGURE 12
INTERIOR CHIMNEY, RUNNING
THROUGH
CEILING AND ROOF