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Deep fryer oil catches fire: what to do?

A deep fryer oil fire can escalate in seconds. Knowing the right immediate actions and what never to do can prevent injury and damage.

Written by Lucas Ferreira · Reviewed by Thomas Weber · Updated October 31, 2026 · Reviewed October 28, 2026 · 3 min read

Immediate actions

  1. 1 Call emergency services immediately if the fire is not instantly extinguished or if there is any doubt.
  2. 2 Turn off the heat source if safe to do so.
  3. 3 Smother the fire with a metal lid or fire blanket, or use a Class K extinguisher.
  4. 4 Never use water on an oil fire.
  5. 5 Evacuate and stay out if the fire does not go out immediately.

What not to do / warning

Never use water on a deep fryer oil fire. Water causes hot oil to explode and can cause severe burns and rapid fire spread.

Deep fryer oil fires are dangerous because hot oil can ignite suddenly and spread quickly. The following guidance follows accepted fire safety advice from organizations such as the National Fire Protection Association (NFPA) and FEMA. Always prioritize your safety and call emergency services if the situation is not immediately controlled.

Emergency warning

If the fire is not put out within a few seconds, or if it is growing, call your local emergency services immediately. Do not attempt to fight a large or spreading fire. Evacuate everyone from the building and stay out.

What to do first

  1. Turn off the heat source. If you can safely reach the controls, switch off the fryer and any heat source. Do not reach over the fire.
  2. Smother the fire. Cover the fryer with a metal lid or a fire blanket. This cuts off oxygen. If you have a Class K extinguisher (for cooking oil fires), use it according to the instructions. Never use a glass lid or ceramic plate, as they can shatter.
  3. Do not move the fryer. Moving a burning fryer can splash hot oil and spread the fire.
  4. Evacuate if the fire persists. If the fire does not go out immediately or if smoke fills the room, leave the building and call emergency services from a safe location.

What NOT to do

  • Never use water. Water causes hot oil to explode violently, spreading fire and causing severe burns.
  • Do not use a fire extinguisher not rated for oil fires. Water, foam, and standard ABC extinguishers can make an oil fire worse. Use only a Class K extinguisher or smother with a lid.
  • Do not attempt to carry the fryer outside. The oil can splash and cause serious injury.
  • Do not fan the flames or use a towel to swat the fire. This can spread burning oil.
  • Do not turn on a vent hood or exhaust fan. This can draw flames into the ductwork.

When to call for help

Call emergency services immediately if:

  • The fire does not go out within a few seconds after smothering.
  • Flames are spreading beyond the fryer.
  • There is heavy smoke or the fire is blocking your exit.
  • Anyone has been burned or inhaled smoke.

What to monitor

After the fire is out, do not use the fryer again until it has been inspected and cleaned by a professional. Monitor for any signs of re-ignition, such as smoke or heat, and keep a fire watch until you are sure it is safe. If you have any burns, seek medical attention.

How to prevent it

  • Never leave hot oil unattended.
  • Keep the fryer at the recommended temperature and do not overfill it.
  • Keep water and ice away from hot oil.
  • Clean up oil spills immediately and keep the area free of clutter.
  • Have a Class K extinguisher or a metal lid nearby.

This is general information and not a substitute for professional fire safety advice. In an emergency, always call your local emergency services.

Sources & references

  • NFPA - Cooking Fire Safety (https://www.nfpa.org/Public-Education/Fire-causes-and-risks/Top-fire-causes/Cooking)
  • FEMA - Fire Safety (https://www.ready.gov/fire)