NFPA 96 guidelines

https://mygreasefirepreventionpulse.ironwoodscope.com/posts/grease-fire-prevention-the-real-cost-of-skipping-kitchen-exhaust-cleaning

NFPA 96 guidelines set the standard for commercial kitchen ventilation systems, covering everything from hood design to exhaust duct cleaning frequency. Following these rules helps prevent grease fires and keeps air clean in busy restaurant kitchens. Inspectors often check for compliance during routine visits.