Class F Fires

Understanding Class F Fires and Fire Extinguisher Ratings

Fire safety is a massive concern for everyone, and it’s crucial to be well-informed about the different types of fires and the right tools to combat them. In this blog post, we will focus on Class F fires, which are fires that involve cooking oils and fats. We will also discuss how Class F fire ratings are assigned to fire extinguishers.

What Are Class F Fires?

Class F fires are a specific category of fire involving cooking oils and fats, such as vegetable oil, animal fat, or even butter. These fires are common in kitchens and other areas where cooking or frying is taking place. Unlike other fire classes, Class F fires are particularly dangerous due to the high temperatures and the potential for the fire to quickly spread if not extinguished properly.

Common causes of these fires include:

1. Overheated oil or fat in cooking pans.

2. Splashes of hot oil onto stovetops.

3. Ignition of grease-laden appliances.

Understanding Class F Fire Extinguisher Ratings

To effectively combat Class F fires, it’s essential to use the right fire extinguisher or firefighting tool. Fire extinguishers are labelled with specific fire class ratings to indicate the types of fires they are suitable for. In the case of Class F fires, specific fire extinguishers must be used. These are likely Wet Chemical fire extinguishers or a not-so-common MultiCHEM fire extinguisher. To find out more about these fire extinguishers, check out a more detailed blog post regarding them HERE.

Class F fire extinguisher ratings typically follow a standard system, which makes it easy for users to select the appropriate extinguisher for the scenario in which they will be placed. These ratings are expressed as “Class F” or “F” and are often accompanied by numerical ratings. For example, you might see an extinguisher labelled as “75F.”

The numerical value accompanying the “Class F” designation represents the scale of the extinguisher’s protection. The number directly correlates to the size of the deep fat fryer it can be used against. For example, a 75F-rated fire extinguisher can be used on all deep fat fryers that are 75 litres and below.  It’s crucial to select an extinguisher with a rating appropriate for the size of the kitchen and the potential fire hazards present.


Understanding Class F fires and knowing how to use Class F fire extinguishers is essential for kitchen safety. Whether you’re a professional chef or a home cook, being prepared for a Class F fire can make all the difference in preventing a minor incident from turning into a major disaster. Always check the fire extinguisher’s rating when choosing a fire extinguisher for a commercial or industrial kitchen.

By following these guidelines and being informed about Class F fires. Hopefully, this can give you the information you need to keep your kitchen and cooking areas safe.

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