What is the minimum height a chimney must be above the highest point of the roof within a horizontal distance of 10 ft?

The minimum height a chimney must be above the highest point of the roof within a horizontal distance of 10 feet is established to ensure the safe and effective venting of combustion gases. This height requirement helps prevent backdrafts and ensures that smoke and gases are carried away from the roof line, minimizing the risk of re-entering the building and maintaining a proper draft for the chimney's function.

A height of 2 feet above the highest point of the roof within that specified distance creates a margin that allows for both safety and efficiency in venting. This standard is consistent with guidelines set by building codes and safety organizations, which are designed to ensure that chimneys are positioned at a sufficient height to avoid obstructions that might impede airflow.

Other options suggest heights that do not meet the established safety margins. Therefore, the requirement of 2 feet is crucial for proper chimney operation and overall safety.