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A letter F marking cooking oil and fat fires.
Also known as: Class F fire, Cooking oil fire class, Class K, Letter F on an extinguisher
Class F covers cooking oil and fat fires, and it exists as a separate class because water and most other agents make them dramatically worse — a wet extinguisher on a chip pan produces a steam explosion. The class is called K in North America.
Denotes fires involving cooking oils and fats in the European fire classification.
Contexts: Public information
Exists as a separate class because water and standard agents cause violent steam expansion and spread burning oil rather than extinguishing it.
Contexts: Public information
Is designated Class K in the North American classification, so the same fire has different class letters in different systems.
Contexts: Public information
Requires a wet chemical extinguisher, which saponifies the oil surface rather than attempting to cool or smother it directly.
Contexts: Public information
A capital letter F printed within a pictogram panel on an extinguisher label, alongside an image of a burning pan.