Fire Safety · The Standard

NFPA 96 Explained, Section by Section

Who it applies to. The intervals by cooking type. The thresholds in microns.

By Arthur Haggerty, Founding Editor · CECS #200452 · Published October 22, 2026

NFPA 96 is the Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations. It is the document a kitchen’s fire marshal, insurer and hood cleaning company all refer to, usually without quoting it. This is what it says, in the order it says it.

Who It Applies To

Any commercial cooking operation that produces grease-laden vapors: restaurants, hotels, hospitals, schools, stadiums, churches with a commercial kitchen, food trucks with a hood. If the cooking makes grease and the grease goes up a hood, the standard applies. Residential kitchens are out. Ghost kitchens and shared commissaries are in.

NFPA 96 is a standard, not a law. It becomes enforceable when a state or local government adopts it, usually through the fire code. The edition in force where a kitchen operates is the one that governs it, and neighboring counties are not always on the same edition.

General Requirements

Cooking equipment that produces grease-laden vapors has to be under a hood, the exhaust system has to carry those vapors outside, and the whole path has to be built, inspected and cleaned so that it does not become the fuel. Everything that follows elaborates on that sentence.

Hoods, Grease Removal and Ducts

The hood captures. The grease removal devices — baffle filters, not mesh — take the first load out of the airstream. The duct carries what gets past the filters to the fan. The standard specifies the duct’s construction (welded, liquid-tight, continuous), its clearance to combustibles, and its access: openings large enough and frequent enough that every section of duct can be reached for inspection and cleaning. A duct without access panels is a duct that cannot be shown to be clean.

Fans and Termination

The exhaust fan sits at the end of the run, usually on the roof. It has to be accessible, hinged so the wheel and housing can be cleaned, and discharged away from the building, the roof surface and any air intake. Grease that leaves the fan has to be contained rather than dripping onto the roof, where it is both a fire load and a slip hazard.

Fire-Extinguishing Equipment

Cooking equipment that produces grease-laden vapors has to be protected by a listed fire-extinguishing system — the wet chemical suppression system over the line. It is inspected and serviced at least every six months by trained, licensed personnel, tested after any appliance change, and tied to shutting off fuel or power to the appliances when it discharges.

Chapter 12 — Inspection and Cleaning: The Part That Decides Everything

This is the chapter the service record lives in.

Inspection frequency is set by cooking type, not by the calendar:

• Solid fuel cooking: monthly
• High-volume cooking (24-hour operations, charbroiling, wok cooking): quarterly
• Moderate-volume cooking: semi-annually
• Low-volume cooking (churches, day camps, seasonal businesses, senior centers): annually

The inspection determines whether cleaning is needed. The trigger is measured grease depth: when contamination on a surface reaches 2,000 microns, the system must be cleaned. In a fan housing, the trigger is 3,175 microns. After cleaning, the surfaces are brought to bare metal, with no more than 50 microns of residual.

Cleaning covers the entire system: hood, filters, plenum, duct in full, fan and termination. The standard requires that the person performing the inspection or cleaning be trained, qualified and certified, that a report be left with the owner showing areas not cleaned and why, and that a label be affixed showing the date and the name of the company. The label is a pointer to the report. It is not the report.

What the Standard Doesn’t Do

NFPA 96 does not set the price, choose the company, or tell the insurer what to do. It gives everyone a common reference. The fire marshal reads it to decide if the kitchen is compliant. The insurer reads it to decide if the risk was what they underwrote. The hood cleaning company reads it to know what “done” means. After a fire, all three read the service record against it.

Where Stovio Advisors Comes In

Stovio Advisors exists to make the standard readable: what it requires, which edition is adopted where a kitchen operates, and what a kitchen’s records have to show to meet it. The fire-safety coverage breaks it down by state and by cooking type.

Read the Coverage: www.getstovio.com/fire-safety

Frequently Asked Questions

About the Author

Arthur Haggerty is the founder of Cleaning Pros Plus, LLC and the family of companies — EvidLY, HoodOps and Stovio Advisors. He is a Certified Exhaust System Inspector (#200771) and a Certified Exhaust Cleaning Specialist (#200452). Cleaning Pros Plus, LLC is a member of the International Kitchen Exhaust Cleaning Association (#76716495). He has been retained as an NFPA 96 expert witness.