Under what circumstances must a clean out be provided for grease laden kitchen exhaust duct?

A clean out for grease-laden kitchen exhaust ducts is critically important for maintaining airflow and preventing the buildup of combustibles, which could lead to a fire hazard. Common codes and safety standards dictate that clean outs must be strategically placed.

A clean out is necessary at a change of direction in the ductwork. This is because changes in direction can create areas where grease can accumulate and become trapped, making it hard to clean.

Additionally, a clean out must be installed every 12 feet along the duct run. This distance is a standard measurement that helps ensure regular access for maintenance and cleaning, further reducing the risk of grease buildup and potential fires.

For vertical ducts, a clean out is required on every floor. This is essential to facilitate cleaning at different levels of a multi-story building and to ensure that any grease accumulating in the ducts can be effectively removed and managed.

Thus, the requirement to provide a clean out under a change of direction, every 12 feet, and every floor in vertical ducts combines to create a comprehensive approach to duct maintenance, ensuring safety and efficiency in grease-laden kitchen exhaust systems.