CONNECTION TO A METAL PREFABRICATED CHIMNEY
When a metal prefabricated chim- ney is used, the manufacturer’s in- stallation instructions must be fol- lowed precisely. You must also pur- chase (from the same manufac- turer) and install the ceiling support package or wall
There are basically two methods of metal chimney installation. One method is to install the chimney in- side the residence through the ceil- ing and the roof (Figure 15). The other method is to install an exterior chimney that runs up the outside of the residence (Figure 16). This method of installation requires at a minimum a wall
The chimney must be the required height above the roof or other ob- struction 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 10).
REMEMBER: Follow the manu- facturer’s installation instructions and maintain the manufacturer’s specified clearance distances.
Interior chimney running through ceiling and roof
FIGURE 15
Exterior chimney running up the outside
of the residence
*Note: Unit has not been tested with a horizontal connector. Refer to local building codes.
FIGURE 16
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