Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations

The cleaning frequency is based on the type and volume of cooking, not the calendar. A busy restaurant that operates a charbroiler 16 hours a day will accumulate grease much faster than a church kitchen that is used once a week. The table above provides general guidelines, but the actual cleaning frequency should be determined by the rate of grease buildup observed during inspections.

Hood cleaning must include the complete exhaust system: the hood interior, filters, ductwork from the hood to the fan, the exhaust fan, and the fan housing. Cleaning only the visible portion of the hood while leaving grease-laden ductwork unaddressed does not satisfy NFPA 96 and leaves a serious fire hazard in place.

Commercial kitchen fire suppression systems (commonly wet chemical systems from manufacturers like Ansul, Kidde, and Pyro-Chem) must be inspected and serviced at least semi-annually (every six months) by a trained and qualified person. Many AHJs and system manufacturers recommend quarterly service for high-volume operations.

During a semi-annual inspection, the technician verifies that the system is armed and that all manual and automatic actuation devices are functioning. The technician checks the expellant gas cartridge for proper weight or pressure, inspects all nozzles to confirm they are aimed correctly and are free of grease or debris, and verifies that the fusible links or detection line is in good condition and properly positioned over the cooking equipment.

The technician also tests the fuel and electrical shut-off mechanisms that are supposed to activate when the suppression system discharges. These interlocks are critical because they cut fuel and electricity to cooking appliances, preventing re-ignition after the suppression agent has been deployed. A suppression system that extinguishes a fire but does not shut off the gas supply to a fryer can quickly result in a re-flash.

NFPA 96 requires that records of all hood cleaning and suppression system inspections be maintained on the premises and made available to the AHJ upon request. Hood cleaning records should include the date of service, the name of the cleaning company, and a description of the areas cleaned. Many jurisdictions require that the cleaning company provide a certificate of service with before-and-after photographs.

Suppression system inspection records must include the date of service, the name and qualifications of the technician, the type and serial number of the system, a detailed list of components inspected and their condition, and any deficiencies found with recommended corrective actions. A service tag or sticker is attached to the system indicating the date of the last inspection.

Failure to maintain these records can result in citations from the fire marshal and potential issues with insurance claims. Many insurance carriers now require proof of NFPA 96 compliance as a condition of coverage for commercial food service operations. If your hood cleaning company or suppression system service provider is not providing detailed documentation, you should address this immediately or switch providers.