What is the acceptable maximum distance between cleanout openings in grease ducts at changes in direction greater than 45 degrees?

The acceptable maximum distance between cleanout openings in grease ducts at changes in direction greater than 45 degrees is indeed 10 feet. This requirement is grounded in the need to ensure proper access for maintenance and cleaning of grease ducts, which can accumulate residues that pose fire hazards and affect the performance of exhaust systems.

Having cleanouts at regular intervals allows for efficient cleaning and inspection without significant hindrance, making it easier to maintain safe operation. The regulation typically emphasizes the importance of accessibility, especially at bends and turns, where grease can build up due to the change in airflow and reduced cleaning efficacy.

Thus, the maximum of 10 feet specified in the code is balanced to promote accessibility while also recognizing the structural and functional aspects of the ductwork. This guideline helps ensure that grease ducts can be effectively maintained, minimizing fire risks and ensuring optimal operation in commercial kitchens and other settings where grease-laden vapors are present.