What is the minimum height a chimney must extend above the highest point where it passes through a roof of a building?

The minimum height a chimney must extend above the highest point where it passes through a roof is established to ensure the safe and efficient discharge of combustion gases. An extension of at least 3 feet above the roof is required to prevent backdrafts and ensure that smoke and gases disperse properly into the atmosphere. This height is critical for minimizing the chance that emissions will re-enter the building or affect nearby structures.

Additionally, the requirement of 3 feet is grounded in safety regulations, which help mitigate risks such as fires or carbon monoxide poisoning. While there are circumstances where a chimney may require a different height based on nearby structures or other considerations, the general standard remains at 3 feet to ensure adequate clearance and efficiency.