The upper edge of a masonry chimney cleanout should be at least how many inches below the lowest inlet opening?

The upper edge of a masonry chimney cleanout being required to be at least 6 inches below the lowest inlet opening is based on safety and functionality standards in construction. This distance is important to prevent any potential buildup of flammable materials or residues from the chimney system. Keeping the cleanout lower ensures that any debris or soot that falls into the cleanout does not obstruct the inlet opening, thus maintaining proper airflow and preventing blockages that could lead to dangerous situations, such as chimney fires or improper venting.

By adhering to this 6-inch standard, inspectors and builders help ensure that chimney systems operate efficiently and safely, mitigating the risk of fire hazards and ensuring compliance with building codes and industry best practices.