Kitchen fires: what to use for grease, electrical, and oven fires

Cooking is the leading cause of home structure fires and fire-related injuries worldwide. Unattended cooking, overheated frying oils, toaster malfunctions, range hood grease accumulation, and gas burner flare-ups ignite thousands of destructive home fires every day.

The single most dangerous mistake people make during a kitchen fire is applying the wrong extinguishing method to the wrong type of fire. Throwing water onto a burning grease pan causes an immediate steam explosion that engulfs the kitchen in an immense fireball, while spraying water onto an energized electrical appliance causes fatal electrocution.

Knowing exactly what extinguishing agent to use for each specific type of kitchen fire, when to evacuate, how to operate fire extinguishers, and how to prevent kitchen flare-ups protects your household and saves lives.

Quick reference guide: what to use for each kitchen fire type

Match your immediate response to the exact source and type of fire:

1. Grease and cooking oil fires (Class K and Class B)

Grease fires occur when vegetable oils, lard, butter, or animal fats are heated past their auto-ignition temperature (typically 315 to 370 degrees Celsius / 600 to 700 degrees Fahrenheit). The oil begins smoking heavily, followed by spontaneous surface ignition across the entire pan:

The correct response protocol

1. Slide a metal lid or flat baking sheet over the pan from the side:
   • Do not drop the lid straight down from above, which can push burning grease over the rim or trap your hand in rising flames.
   • Slide a tight-fitting metal lid, metal sheet pan, or flat metal tray smoothly across the rim of the pan from the side.
   • This immediately seals off atmospheric oxygen, suffocating the flames within seconds.
2. Turn off the stove burner immediately:
   • If you can reach the stove control knob safely without reaching across the flames, shut off the burner.
3. Leave the lid in place until completely cold:
   • Never lift the lid to check if the fire is out. If you lift the lid while the oil remains above its auto-ignition temperature, the sudden influx of fresh oxygen causes the grease to reignite instantly.
   • Leave the covered pan undisturbed on the cold burner for at least 30 to 45 minutes.
4. Use baking soda or salt for minor flare-ups:
   • If a lid is not within reach and flames are small, pour large quantities of sodium bicarbonate (baking soda) or table salt directly onto the flames.
   • When heated, baking soda releases carbon dioxide gas, which displaces oxygen and smothers the fire.
   • You will need at least a full cup of baking soda; a tiny sprinkle is ineffective.
5. Use a certified fiberglass fire blanket:
   • If you keep a fiberglass fire blanket mounted near your kitchen exit, pull the quick-release tabs to unfold it.
   • Wrap the top edges of the blanket around your hands to shield your skin from heat, and gently drape the blanket over the burning pan.

What never to use on a grease fire

• Never throw water on a grease fire:
  • Water and oil do not mix. Water is significantly denser than cooking oil, so thrown water instantly sinks to the bottom of the burning pan.
  • At temperatures over 300 degrees Celsius, that liquid water instantly vaporizes into steam, expanding to 1,700 times its original liquid volume in milliseconds.
  • This violent explosive expansion blasts superheated, atomized burning oil droplets upward and outward in all directions, creating an immense fireball that scorches ceilings, ignites cabinets, and covers your face, chest, and arms in third-degree grease burns.
• Never use flour, cornstarch, or baking powder:
  • Flour and cornstarch are finely powdered carbohydrates. When thrown onto a fire, the fine dust particles disperse in the air and create an explosive combustible dust explosion.
  • Baking powder contains chemical leavening agents that release moisture, which can cause hot oil to splatter violently.
• Never attempt to carry the burning pan outside or to the sink:
  • Panic often drives people to grab the burning skillet handle to run outside or dump it into the kitchen sink.
  • Carrying a burning pan sloshes 350-degree flaming liquid onto your hands, legs, and kitchen rugs, spreading multiple fires across your escape route.

2. Oven and broiler fires

Oven fires typically start when greasy roasts, turkey drippings, or bubbling cheese casseroles spill onto bottom heating elements or gas burners:

1. Turn off the oven heat:
   • Immediately turn the temperature dial or digital control to Off.
2. Keep the oven door firmly closed:
   • Modern ovens are heavily insulated metal containment boxes designed to withstand high temperatures.
   • With the door closed, the fire rapidly consumes the limited oxygen inside the closed cavity and starves itself out within minutes.
3. The backdraft hazard of opening the door:
   • Never open the oven door to inspect the fire or spray water inside.
   • Opening the door introduces a sudden rush of fresh room oxygen, triggering an immediate backdraft fireball that blows outward directly into your face and hair.
4. When to evacuate:
   • If thick black smoke or flames begin leaking heavily around the door seals, or if the fire fails to extinguish after two minutes, evacuate the building and dial emergency services.
   • Once the fire is out, wait until the entire oven is cool to the touch before opening the door to inspect damage.

3. Microwave fires

Microwave fires occur when metal utensils, foil wrappers, twist-ties, or dry food items (such as overcooked popcorn or dry sponges) ignite inside the cavity:

1. Keep the microwave door closed:
   • Leave the door latched to starve the flames of oxygen.
2. Cut electrical power:
   • Unplug the microwave power cord from the wall outlet, or go to your circuit breaker panel and switch off the kitchen circuit breaker.
3. Wait for complete cooling:
   • Keep the door shut until the fire has completely extinguished and the appliance has cooled down.
   • Never reuse a microwave that has suffered an internal fire. The fire compromises internal cavity seals and the magnetron waveguide, creating microwave radiation leakage hazards.

4. Countertop electrical appliance fires (Toasters, air fryers, kettles)

Electrical fires in the kitchen are triggered by frayed cords, overloaded outlets, grease buildup inside air fryer heating elements, or mechanical motor seizures:

1. Disconnect the electricity before attempting to fight the fire:
   • Pull the plug from the wall outlet if you can do so safely, or switch off the circuit breaker at the electrical panel.
   • An electrical fire cannot be fully extinguished if continuous high-voltage alternating current continues energizing the short circuit.
2. Never throw water on an energized electrical appliance:
   • Tap water contains dissolved minerals that conduct electricity. Pouring water on a plugged-in toaster or blender creates a direct electrical pathway back to your body, causing severe electrical shock or fatal electrocution.
3. Use a Class C or Class ABC dry chemical extinguisher:
   • Once power is disconnected, discharge an ABC dry chemical extinguisher or cover the appliance with a fire blanket.

5. Kitchen range hood and exhaust duct fires

Range hood fires occur when stovetop flames ignite accumulated grease on the underside of the range hood, mesh filters, or interior ductwork:

1. Shut off the exhaust fan immediately:
   • An active exhaust fan draws air upward, acting like a forced-air blast furnace that sucks flaming grease into concealed ductwork and attic roof spaces.
2. Smother the stovetop source:
   • Cover the burning pan below with a metal lid or fire blanket.
3. Discharge an extinguisher if flames reach the hood:
   • Aim a Class K or Class ABC extinguisher directly at the underside of the hood and into the filter plenum.
4. Evacuate if fire enters the ductwork:
   • If you hear roaring or crackling inside the wall or ceiling above the hood, the fire has spread into structural framing. Evacuate everyone from the home immediately and call 911 or your local emergency number.

6. Gas stove flare-ups and burner emergencies

Gas cooktops present unique hazards due to pressurized fuel delivery:

1. Turn off the burner control knob:
   • Shutting off the burner dial cuts off fuel flow to the burner head.
2. Shut off the appliance gas valve if flames persist:
   • If flames burn behind the stove or around the flexible supply hose, turn the gas appliance shutoff valve (a quarter-turn yellow or red lever located on the gas pipe behind or beside the range) perpendicular to the pipe.
3. Never extinguish gas flames without shutting off the fuel supply:
   • If you blow out or extinguish a pressurized gas flame while gas continues flowing, raw natural gas or propane fills the room, creating an imminent risk of a catastrophic whole-house fuel-air explosion.
4. Smother cooking fires on gas burners:
   • Use a metal lid, sheet pan, or fire blanket. Do not blow on burning oil.

7. Deep fryer and holiday turkey fryer emergencies

Deep fryers hold large volumes of cooking oil at temperatures exceeding 180 degrees Celsius (350 degrees Fahrenheit), creating severe burn and fire risks:

1. Turkey fryer outdoor rules:
   • Never use an outdoor propane turkey fryer indoors, in a garage, on a wooden deck, or under a porch roof.
   • Set the fryer on level bare ground at least 3 meters (10 feet) away from all structures, fences, and overhangs.
2. Thawing rules to prevent boilover explosions:
   • Never place a frozen or partially frozen turkey into hot oil. Ice contacting hot oil instantly turns to steam, expanding 1,700 times and forcing gallons of boiling oil over the sides onto open propane burner flames, creating an instant ten-foot wall of fire.
   • Completely thaw and dry the turkey with paper towels before lowering it slowly into the pot.
3. What to do if a deep fryer catches fire:
   • Turn off the gas supply or unplug the electric cord if safe to do so.
   • Never touch or attempt to move the hot pot.
   • Deploy a Class K wet chemical extinguisher or a heavy fiberglass fire blanket. Call emergency services immediately.

Fire extinguisher classifications for kitchen use

Understanding extinguisher labels ensures you deploy the correct firefighting agent:

Class K wet chemical extinguishers (The professional standard)

• How it works: Class K extinguishers discharge an alkaline wet chemical solution (typically potassium acetate, potassium carbonate, or potassium citrate).
• The saponification effect: When the potassium solution strikes burning cooking oil, it reacts chemically with the hot fatty acids through a process called saponification, converting the surface oil into a thick, soapy, non-flammable foam blanket.
• Cooling: This foam blanket traps vapors, cools the oil below its flashpoint, and prevents reignition. Class K extinguishers are the safest, most effective tool for deep fryers and oil cooking.

Class ABC dry chemical extinguishers

• Application: The standard residential multi-purpose extinguisher. Effective on wood, paper, trash (Class A), flammable liquids (Class B), and energized electrical equipment (Class C).
• Caution on grease: When using an ABC dry chemical extinguisher on a burning frying pan, stand at least 2 to 3 meters (6 to 10 feet) away. The high-pressure discharge nozzle can splatter liquid burning oil if aimed directly into the pan at close range.

How to use an extinguisher: the PASS technique

1. P - Pull: Pull the safety pin located at the top of the handle to break the tamper seal.
2. A - Aim: Aim the discharge nozzle or hose low, pointing directly at the base of the fire, not at the rising flames.
3. S - Squeeze: Squeeze the lever slowly and steadily to release the extinguishing agent.
4. S - Sweep: Sweep the nozzle smoothly from side to side across the base of the fire until all flames are extinguished.

When to stop fighting and evacuate immediately

Never let pride or property attachment risk your life. Evacuate your home and call emergency dispatch (911, 112, or 999) immediately if:

• The flames are taller than you or have spread beyond the pan onto walls, cabinets, curtains, or the ceiling.
• The room begins filling with dense, acrid smoke that makes breathing difficult or obscures your vision.
• Your discharge from a fire extinguisher fails to extinguish the fire within ten seconds.
• You do not have a clear, unblocked exit path behind you. Never let a fire get between you and the room exit.
• When evacuating, close all interior kitchen doors behind you. A closed wooden door starves the fire of oxygen and slows the spread of toxic smoke, buying valuable minutes for arriving firefighters.

How to prevent kitchen fires before they start

Over 90 percent of kitchen fires are entirely preventable through simple operating habits:

1. The three-foot clearance rule

• Establish a 1-meter (3-foot) safety perimeter around the stove. Keep oven mitts, wooden spoons, paper towel rolls, plastic food packaging, and recipe books away from heating elements.
• Secure loose clothing, roll up long sleeves, and tie back long hair before cooking over open burners.

2. Understand oil smoke points

Different cooking oils have vastly different thermal limits:

• Low smoke point (Do not use for deep frying): Extra virgin olive oil (190°C / 375°F) and unclarified butter (150°C / 300°F) burn and smoke quickly.
• High smoke point (Safe for searing and frying): Avocado oil (270°C / 520°F), peanut oil (230°C / 450°F), and canola oil (205°C / 400°F).
• If oil begins smoking, it is signaling that it has reached its decomposition temperature and is seconds away from catching fire. Immediately remove the pan from the burner and turn off the heat.

3. Clean range hood grease filters monthly

• The metal mesh filters inside your kitchen range hood trap airborne grease vapors during cooking.
• If filters are not washed, accumulated oil coats the ductwork. If a stovetop flare-up occurs, the flames get sucked into the hood, igniting the grease filter and channeling fire straight into the attic and roof framing.
• Remove mesh filters monthly and soak them in hot water with grease-cutting dish detergent or run them through a dishwasher cycle.

4. Never leave high-heat cooking unattended

• The leading cause of kitchen fire deaths is unattended frying, boiling, and broiling.
• If you must step away from the kitchen for even thirty seconds to answer the front door or check on a child, turn off the burner or take a wooden spoon with you in your hand as a physical reminder that cooking is active.

5. Install the correct smoke alarm type near the kitchen

• Use photoelectric smoke alarms or alarms with a hush button near kitchen areas rather than ionization alarms, which trigger frequent false alarms from harmless cooking toast or steam.
• Place the alarm at least 3 meters (10 feet) away from the cooking stove to minimize nuisance alarms while maintaining early warning capability.

Related guides

• House fire safety and evacuation
• Burns: first aid and emergency treatment
• Appliance fires
• Electrical fires and sparks
• Carbon monoxide
• Thanksgiving and holiday emergencies
• Emergency numbers directory