Every commercial kitchen fire has the same first act: cooking produces grease-laden vapor, the exhaust system pulls it up and out, and along the way it cools and condenses onto the walls of the duct. Day after day, service after service, the layer builds where no one in the kitchen ever looks. NFPA’s data puts it plainly — 61% of restaurant structure fires involve cooking equipment, and failure to clean is a factor in 22%.
A flare-up on the line — a fryer boil-over, a charbroiler flame — reaches the filters and the hood. In a clean system that’s a bad moment on the line. In a greased system it’s a fuse: the flame climbs into the plenum, finds the grease layer in the duct, and the duct becomes a chimney of fuel running to the roof. That’s why the fire departments find these fires at the rooftop fan, and why a “small” hood fire can involve the whole building.
Cleaning the canopy and filters removes the grease you can see and leaves the duct — the fuse — exactly as loaded. It produces a sticker without producing safety. NFPA 96 describes cleaning the entire exhaust path to bare metal for exactly this reason, and calls for access panels so the whole duct can actually be reached. What compliant includes.
Wood and charcoal add creosote and heavy particulate to the grease — a more combustible deposit that builds faster. That’s why NFPA 96 puts solid-fuel operations on a monthly cleaning cycle. If you’ve added a wood-fired oven or smoker to a kitchen that used to be semi-annual, your tier changed the day you lit it.
The prevention is unglamorous: a trained, insured company on your tier’s schedule, cleaning hood to fan, photographing the duct before and after, leaving the report and the sticker. Do that, and the 2 a.m. fire in the duct is somebody else’s story. Skip it, and the odds are NFPA’s.
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Information on this site is general guidance on NFPA 96 and commercial kitchen exhaust maintenance, not a compliance determination for your specific kitchen — your local fire authority makes that call. Lexington Hood Cleaning is a referral service and does not itself perform exhaust cleaning, inspection, or certification.