What is the minimum distance above the chimney where it passes through the roof?

The minimum distance above the chimney that it must extend when passing through the roof is set to ensure that the chimney maintains effective ventilation and minimizes the risk of fire hazards. This requirement helps to reduce the chance of embers being blown off the top of the chimney and igniting nearby structures, while also improving the draw of the chimney for smoke.

A height of at least 3 feet above the roof line allows for proper clearance, ensuring that any fumes or smoke are effectively vented away from the roof and adjacent structures. This distance also helps to mitigate potential risks associated with downdrafts and creates a safer environment surrounding the chimney installation. Proper adherence to this specification is crucial for compliance with building codes and safety regulations.