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A bank of stainless commercial fryers under a steel exhaust hood, white wet chemical suppression agent coating the vats and the hood filters after a discharge, a thin haze of smoke drifting up into the hood, the frying station deserted.

Commercial Fryer Fire or Grease Flare Under the Hood

A commercial fryer fire is burning oil in or around the vat, a flare that climbs into the hood filters, or a blaze that sets off the kitchen's automatic suppression system over the frying station.

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  • Gas, fire, food at risk or water near power
  • 5 questions that narrow it
  • 6 causes, cheapest first

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Gas or fire? Everyone out first. Food at risk? Move it

A fryer or grease fire is a 911 call the moment it spreads beyond the vat or the suppression system goes off. Suppression or Class K as taught, never water, everyone out. Nothing on the line is relit until the suppression system is recharged and the fryer checked.

What it
usually means.

Frying oil does not burn at its working temperature; it burns when it passes its flash point, and several ordinary things bring that point closer. Oil used past its life breaks down and smokes and ignites lower than fresh oil. A vat run low bares its heating tubes or elements, which then overheat the thin layer left. A thermostat that sticks calling for heat lets the oil climb, and the separate high-limit control, the fryer's last line of defense, should cut the heat before ignition but can fail too. Crumbs and breading charred in the cold zone, and grease soaked into hood filters above, give a flame somewhere to spread. Every fryer under a hood is covered by a fixed suppression system with nozzles over the vats, a manual pull station and a fuel shutoff, plus a Class K wet chemical extinguisher on the wall. Those are the tools, used the way the staff were taught. Water is never one of them: it flashes to steam under the oil and throws burning oil across the kitchen. Anyone in doubt leaves and calls 911, and after any discharge both the suppression system and the fryer are serviced before the vat is heated again.

A technician in a plain gray work shirt, seen from behind and shoulders down, kneels at the open lower door of a cold stainless gas fryer on a restaurant cooking line, a small flashlight pointed at the gas valve and pilot area inside, the empty vat and baskets above, the fryer clearly the subject, even kitchen light. The 6 causes, cheapest first

Answer these first

01

Did the flame start in the vat, in the hood filters above it, or under the fryer by the burners?
02

Did the suppression system discharge, and did it shut the gas or power to the line?
03

How many days had the oil been in use, and was it smoking before the flare?
04

Was the oil level below the fill line, or had the vat just been refilled with solid shortening?
05

Did the fryer keep heating past its set point before the fire, as far as anyone could tell?

Check these
before you book.

Commercial fryer fire: 5 checks, and none of them costs anything.

01

Use the hood suppression pull station or the Class K extinguisher the way your staff were taught, and never throw water on burning oil.

02

Get everyone away from the frying station and out of the building, and call 911 whenever flame climbs into the hood or will not go out.

03

Shut off the fryer and the gas at the appliance valve or the main only if you can reach it without leaning over the vat.

Also worth checking

  • Leave the vat where it is: never carry, drain or skim hot oil, and never reach into the fryer while it is hot.
  • Keep the whole line off until the suppression system has been recharged by its contractor and the fryer has been inspected.

The causes,
cheapest first.

6 things commercial fryer fire or grease flare under the hood turns out to be, from oil kept in service past its life to heat and smoke damage after a discharge.

The cost guide
  1. 01 no repair

    Oil kept in service past its life

    Dark, foaming, thin oil smokes early and lights at a lower temperature than fresh oil. Changing it on the schedule the filtration log shows, rather than stretching it through one more weekend, removes this cause entirely.

    No repair: check it yourself
  2. 02 no repair

    Oil level left below the fill line

    Topping up only at the end of the night leaves heating tubes or elements barely covered during a rush. Oil is kept at its mark throughout service, and solid shortening is melted in the fryer's own melt cycle.

    No repair: check it yourself
  3. 03 low

    Charred breading in the cold zone and filters

    Crumbs that sink below the tubes and bake there for days can smolder, and hood filters thick with grease let a flare travel upward. Daily filtration and filter washing are set up with the crew on a maintenance visit.

    Fixed by commercial preventive maintenance plan On a piece of commercial cooking equipment
  4. 04 moderate

    Thermostat stuck calling for heat

    A control that no longer opens lets the oil climb well past the set point. The thermostat or probe is tested against a reference thermometer and replaced before the fryer returns to the line.

    Fixed by commercial fryer repair On a piece of commercial cooking equipment
  5. 05 moderate

    High-limit that failed to trip

    The high-limit is a second, independent control meant to cut all heat before oil reaches ignition. When a fire happened anyway, it is replaced and its trip point is verified during the visit.

    Fixed by commercial fryer repair On a piece of commercial cooking equipment
  6. 06 varies

    Heat and smoke damage after a discharge

    Flame and suppression agent reach wiring, gas valves and igniters around the vat. The fryer is inspected part by part and the findings are written up for the insurer and the suppression contractor.

    Fixed by commercial fryer repair

The makes
it happens on.

35 makes on this site; commercial fryer fire or grease flare under the hood can show up on any of them. Each mark opens that make's own page.

All 35 brands

Commercial Fryer Fire or Grease Flare Under the Hood,
where we come out.

9 metros, each with its own page.

All service areas

Tampa BayFL · 31 areas

OrlandoFL · 30 areas

Miami / South FloridaFL · 47 areas

New York MetroNY · 75 areas

HoustonTX · 36 areas

ChicagoIL · 50 areas

Los AngelesCA · 95 areas

San DiegoCA · 31 areas

San Francisco Bay AreaCA · 74 areas

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Questions about
commercial fryer fire or grease flare under the hood.

The suppression system fired over the fryers. Can we clean up and reopen tonight?
Not until the system has been recharged and reset by its contractor and the gas or power shutoff it tripped is restored properly. The fryer should also be checked, because the agent and heat reach its controls.
Why not smother a small flare with a lid or a sheet pan?
Fixed suppression and a Class K extinguisher are what the kitchen is equipped and taught to use. Reaching over a burning vat with a pan puts arms and faces right at the flame.
How can we tell when fryer oil has reached the end of its life?
It darkens, foams, smokes at normal frying temperature and gives food an off taste. Test strips and the filtration log help the crew change it on time instead of by eye.
Does the fryer need its high-limit tested after a fire?
Yes. A fire means the thermostat and the high-limit both let the oil get too hot, so both are tested or replaced before the vat is filled again.

Back to your everyday

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Book with what you checked above — 5 answers save the technician the first part of the visit.

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