What NFPA 96 Is and Why It Applies to You
NFPA 96 is the National Fire Protection Association's Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations. Most cities and counties adopt it into their fire code, which means your local fire marshal — the Authority Having Jurisdiction (AHJ) — can require proof that your kitchen exhaust system is inspected and cleaned on schedule. Grease accumulation in hoods, ducts, and exhaust fans is a leading cause of restaurant fires, and it is also the part of the kitchen you cannot see without opening the system up.
Inspection Frequency by Cooking Volume (NFPA 96 Table 12.4)
NFPA 96 requires the entire exhaust system to be inspected for grease buildup by a properly trained, qualified, and certified person on this schedule:
| Cooking Operation | Typical Examples | Inspection Frequency |
|---|---|---|
| Solid-fuel cooking | Wood- or charcoal-fired ovens, grills, and smokers | Monthly |
| High-volume cooking | 24-hour operations, charbroiling, wok cooking | Quarterly |
| Moderate-volume cooking | Typical full-service restaurant kitchens | Semiannually |
| Low-volume cooking | Churches, day camps, seasonal businesses, senior centers | Annually |
Note that these are inspection frequencies. The inspection determines whether cleaning is required — though in practice, most kitchens on a quarterly or semiannual inspection schedule find enough buildup that inspection and cleaning happen in the same visit, which is why the schedule is often described as a cleaning schedule.
The Grease-Depth Trigger
NFPA 96 makes the cleaning decision measurable. Using a grease depth gauge comb, if the inspection finds a grease depth of 0.078 inches (2000 micrometers) on surfaces inside the hood, duct, or fan, the contaminated portions of the system must be cleaned. The cleaning itself must remove combustible residue down to no more than 0.002 inches (50 micrometers) — effectively back to bare metal. A surface wipe-down of the visible hood does not meet the standard; the ductwork and exhaust fan must be accessible and cleaned too.
Documentation Your Fire Inspector Expects
- A service certificate or hood sticker showing the company, the person performing the work, and the date of service.
- A written report stating which components were cleaned and — just as important — any areas that were inaccessible or not cleaned.
- Before-and-after photos of the hood plenum, duct interior, and exhaust fan.
- Records kept on-site and available for the AHJ, your insurer, or your landlord.
What Happens If You Fall Behind
Beyond the fire risk itself, missed service commonly surfaces three ways: a failed fire inspection (with re-inspection deadlines or fines set by your AHJ), an insurance problem — insurers can deny or contest a grease-fire claim when required exhaust cleaning records are missing — and lease violations where landlords require proof of compliance. Staying on schedule is far cheaper than any one of those outcomes.