Every commercial kitchen fire shares a first act: cooking produces grease-laden vapor, the exhaust pulls it upward, and along the way it cools and condenses onto the duct walls. Service after service, the layer builds where nobody in the kitchen ever looks. NFPA’s data says the rest 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 — climbs to the filters and hood. In a clean system, that’s a bad moment. In a greased system it’s a fuse: flame enters the plenum, finds the deposit in the duct, and the duct becomes a chimney of fuel running to the roof. It’s why departments find these fires at the rooftop fan, and why a “small” hood fire can involve the whole building — or the neighboring tenants in a strip of restaurants.
Cleaning the canopy and filters removes the grease you can see and leaves the fuse loaded. It produces a sticker without producing safety — which is exactly why NFPA 96 describes cleaning the entire exhaust path to bare metal, with access panels so the whole duct can actually be reached. What compliant includes.
Wood and charcoal add creosote to the grease — a faster-building, more combustible deposit — which is why NFPA 96 puts solid-fuel operations on a monthly cycle. The smoker that upgraded your barbecue upgraded your tier with it.
A trained, insured company on your tier’s schedule, cleaning hood to fan, photographing before and after, leaving the report and the sticker. Do that and the 2 a.m. duct fire 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. Greenville Hood Cleaning is a referral service and does not itself perform exhaust cleaning, inspection, or certification.