NFPA 96 requirements

https://post-wiki.win/index.php/Why_Bare_Metal_Standards_Matter_in_Kitchen_Exhaust_Cleaning

NFPA 96 requirements set the standard for commercial kitchen ventilation to prevent grease fires. They cover hoods, ducts, fans, and cleaning schedules—things like monthly inspections for heavy-use kitchens and mandatory clearance from combustibles. It's all about keeping grease from turning into a fire hazard.