By how much must chimneys extend higher than any portion of the building within 10 feet?

Chimneys must extend at least 2 feet higher than any portion of the building within a 10-foot horizontal distance. This requirement is rooted in safety and structural integrity. The elevation helps prevent hazardous conditions, such as the possibility of smoke or fumes entering the building due to downdrafts. When chimneys are adequately elevated above surrounding structures, it ensures proper ventilation and reduces the risk of fire hazards from building close proximity.

The specific measurement of 2 feet is also recognized in building codes and standards, as it successfully mitigates the risks associated with chimney operation and ensures effective dispersal of emissions. This establishes a practical guideline for ensuring that chimney specifications meet performance and safety expectations.