What is the minimum height that the upper edge of a masonry chimney cleanout should be below the lowest inlet opening?

The correct minimum height for the upper edge of a masonry chimney cleanout to be located below the lowest inlet opening is 6 inches. This requirement is critical for ensuring proper functionality and safety in chimney systems.

Having the cleanout at least 6 inches below the lowest inlet opening helps prevent the entry of water into the chimney, which can happen if the cleanout is positioned too high or at the same level as the inlet. This water intrusion can lead to deterioration of the chimney structure and create an environment conducive to blockages and unsafe flue gas accumulation.

Setting this minimum height also aids in maintaining the efficiency of the chimney system and helps facilitate cleaning and maintenance activities, ensuring that accumulated debris can be removed effectively without obstruction. Compliance with this regulation contributes to safe operation and helps prevent chimney fires and other hazards associated with improper chimney maintenance.