NFPA 96 sets four possible cleaning frequencies based on cooking type and volume: monthly for high-volume solid-fuel or wok cooking, quarterly for high-volume standard cooking operations, semi-annually for moderate-volume operations, and annually for low-volume or non-grease cooking. The interval is not the kitchen’s choice but is determined by the actual cooking done, and the AHJ can require a more frequent schedule if grease accumulation warrants it.
The NFPA 96 standard establishes these intervals because grease accumulation in the hood, plenum, and ductwork is the primary fuel source for commercial kitchen fires, and the cleaning frequency directly controls how much grease builds up. The dirtier and heavier the cooking, the faster grease accumulates, and the more often it has to be removed before it reaches a level that would sustain or spread a fire.
Monthly cleaning is required for kitchens with solid-fuel cooking equipment, such as wood-burning or charcoal equipment, and for wok cooking operations, because these produce exceptionally high grease and particulate loads. High-volume charbroilers can also fall into the monthly or quarterly tier depending on their output. These are the operations where grease accumulates fast enough that a longer interval creates real fire risk.
Solid-fuel cooking and wok operations are the most intensive producers of grease-laden vapor in a commercial kitchen. A wood-fired oven or charcoal grill running at volume during dinner service every night of the week can coat a hood and ductwork in the time that a lighter cooking operation would show minimal accumulation. For those kitchens, monthly cleaning is the safeguard that keeps the system safe between meals.
Quarterly cleaning applies to high-volume standard cooking operations running at significant daily output, such as a busy full-service restaurant. Semi-annual cleaning applies to moderate-volume kitchens with regular but lighter cooking output. Annual cleaning covers low-volume cooking, seasonal operations, or operations using equipment that produces minimal grease, such as steam tables or pizza ovens without significant charring.
| Interval | Cooking Type / Volume | Common Examples |
|---|---|---|
| Monthly | Solid-fuel, wok, extremely high-volume | Wood-fired kitchens, wok stations, heavy charbroil |
| Quarterly | High-volume standard cooking | Busy full-service restaurants, high-output fast casual |
| Semi-annual | Moderate-volume operations | Mid-volume restaurants, hotel kitchens, corporate cafeterias |
| Annual | Low-volume or non-grease cooking | Pizza ovens, steam tables, seasonal or part-time kitchens |
The cleaning interval is determined by evaluating the type of cooking equipment and operating volume against the NFPA 96 criteria, and the authority having jurisdiction can require a more frequent schedule if inspection finds grease accumulation indicating the current interval is not sufficient. The kitchen cannot simply choose the least frequent option; the actual cooking volume and equipment type govern the answer.
In practice, a licensed hood cleaning company assesses the kitchen and recommends the appropriate interval based on what is being cooked and how often. If the AHJ inspector finds heavy grease accumulation at an inspection, they can push the kitchen to a more frequent schedule regardless of what the current service contract says. Grease levels on the day of inspection are the field evidence, and a system that shows up heavily loaded is its own argument for a tighter interval.
Each required cleaning covers the entire exhaust system from the cooking surface up: the filters, the plenum, the duct interior from the hood to the rooftop exhaust fan, and the fan itself. Cleaning only the visible hood filters without addressing the duct and fan leaves grease accumulation in the areas most likely to sustain a fire spreading up and out of the kitchen.
This is the most common shortcut in kitchen hood cleaning, and it is also the most dangerous. Grease in the ductwork above the visible hood is out of sight but very much in play if a fire starts at the cooking surface. A certified cleaning that produces a service report documenting the full system, fan to filter, is the standard the AHJ expects and the one a fire marshal checks for. If you are looking for a kitchen hood cleaning company near me, confirm they clean and document the full duct run, not just the filters and visible hood surfaces.
The most common kitchen hood compliance mistake is landing on a less-frequent cleaning interval than the cooking volume actually requires. A high-volume kitchen on a semi-annual schedule is not a cost savings. It is a fire risk and a code violation. If your kitchen has grown its output since the last time the interval was reviewed, the schedule may need to move up a tier.
NFPA 96 sets four possible cleaning frequencies based on cooking type and volume: monthly for solid-fuel or wok cooking and extremely high-volume operations, quarterly for high-volume standard kitchens, semi-annually for moderate-volume operations, and annually for low-volume or non-grease cooking. The actual cooking done determines the interval, not a default choice.
The cleaning interval is determined by evaluating cooking equipment type and operating volume against NFPA 96 criteria. A licensed company assesses the kitchen and recommends the interval, and the authority having jurisdiction can require a more frequent schedule if inspection finds grease accumulation indicating the current interval is insufficient.
NFPA 96 requires cleaning the full exhaust system: filters, plenum, duct interior from hood to rooftop fan, and the fan itself. Cleaning only the visible filters while leaving the duct and fan unaddressed is a non-compliant shortcut that leaves grease in the areas most likely to sustain a fire spreading up through the ductwork.
An overdue hood cleaning is a fire code violation and a safety risk. Grease accumulates to a level that can sustain and spread a fire, and a fire marshal finding heavy accumulation during an inspection can issue a deficiency notice, require immediate correction, and push the kitchen to a more frequent cleaning schedule going forward.
The wrong cleaning interval is a fire hazard and a code violation at the same time. Our company assesses your cooking volume and equipment type and puts you on the right schedule. Florida Fire Solutions is a licensed fire protection company serving restaurants and commercial kitchens across Miami-Dade. Reach out and you will hear directly from Ozzie and our team.
Florida Fire Solutions | Florida Fire Protection Contractor I | License #FPC25-000017 | Miami-Dade, Broward & Palm Beach County
