NFPA hood cleaning standards

https://tiny-wiki.win/index.php/How_to_Evaluate_Kitchen_Exhaust_Cleaning_Services_for_Your_Restaurant

NFPA hood cleaning standards are fire safety guidelines that specify how often commercial kitchen exhaust systems need professional cleaning. These rules help prevent dangerous grease buildup that can cause restaurant fires. Most establishments require cleaning every three to six months, depending on cooking volume and grease output. Violations can lead to serious fire hazards or insurance problems.