What NFPA 96 Is and Why It Matters
NFPA 96 is the Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations, published by the National Fire Protection Association. It is the document that tells restaurant operators, building inspectors, and fire marshals what proper kitchen exhaust maintenance looks like. Most commercial property insurance policies and municipal fire codes in Massachusetts and Connecticut reference NFPA 96 directly.
The relevant piece for kitchen operators: the standard defines required cleaning frequencies for exhaust hoods, grease ducts, and associated equipment based on cooking volume. High-volume cooking operations — busy restaurants, school cafeterias, hospital kitchens — need cleaning quarterly. Moderate-volume operations typically fall on a semi-annual schedule. Lower-volume locations may qualify for annual cleaning. But those are minimums, not suggested intervals.
What NFPA 96 Compliant Cleaning Actually Covers
A compliant cleaning under NFPA 96 is not just wiping down the visible hood surfaces. The standard requires cleaning of the entire grease-laden vapor exhaust path — from the cooking surface up through the hood plenum, through the entire duct run, to the exhaust fan and discharge point at the roof. Grease accumulation anywhere in that path is a fire hazard.
After cleaning, the contractor should provide a written report documenting what was cleaned, the condition of the system, any areas that couldn't be fully accessed (noted with location), and the date of service. That documentation is what you hand to an insurance adjuster or fire inspector if questions arise.
Where Operators Get Into Trouble
The most common compliance failure we see is companies that clean the visible parts of the hood and plenum but don't follow the duct run all the way to the fan. Grease accumulates in horizontal duct sections, at elbows, and in the fan housing itself. A cleaning that misses those areas may look complete on paper but leaves the highest-risk accumulation untouched.
The other common issue: no documentation. If you can't show a dated service report with the contractor's information when an inspector asks, the cleaning might as well not have happened from a liability standpoint.
What to Ask Your Cleaning Contractor
Ask whether they clean the full duct run or just the hood and plenum. Ask what access points they open and how they document sections that are difficult to reach. Ask whether they provide a signed service report with before-and-after photos. A contractor who can answer those questions clearly is worth the call.
