When a metal prefabricated chimney is used, the manufacturer's installation instructions must be followed. You must also purchase 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 proper
clearance to the structure as recommended by the manufacturer. The chimney must be the required height above the roof or other obstructions for safety and
proper draft operation.
Listed Double Wall
Minimum vertical of 36" before any offset.
Single Wall
Horizontal Maximum of 36" with 1/4" rise per foot.
NOTE: Recommend using 2-45º instead of 90º to improve draft