How high must a chimney for a wood-burning appliance extend above the roof line?

A chimney for a wood-burning appliance must extend at least 3 feet above the roof line to ensure proper draft and to minimize the risk of downdrafts, which can lead to smoke entering the living space. This height also helps to reduce the possibility of spark ignition on the roof or surrounding structures by keeping any potential embers well clear of combustible materials.

The requirement for a minimum height of 3 feet, in conjunction with the need for the chimney to extend at least 2 feet above any obstruction (like a ridge line) within a horizontal distance of 10 feet, ensures that the chimney can perform effectively while complying with safety standards. This height regulation is part of the building codes and best practices for chimney installation, which are designed to enhance both the efficiency and safety of a wood-burning appliance.