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Class F fires and Wet Chemical extinguishers

Class F fires are fires involving cooking oils or fats. Class F fires differ from conventional liquid fires due the high temperatures involved. In this factsheet we cover the issues involved with Class F fires and how to choose a Fire Extinguisher to cope with this risk.

Class F fires and Wet Chemical Extinguisers Factsheet

• The problems of extreme heat
• Conventional portable fire extinguishers
• Splash risk
• Class F extinguishers
• Why extinguishers?
• The British Standard 7937:2000

Sample Extract

To extinguish a fire created by auto ignition the flames must be extinguished and the temperature of the burning liquid reduced below the auto ignition temperature. The amount of heat involved with the liquid above 340°c is high and the use of the incorrect extinguisher can be extremely dangerous. For example a water jet extinguisher directed at the surface of burning cooking oil will create an explosion as the water is quickly converted into steam resulting in the expulsion of burning oil possibly spreading the fire and harming the operator.

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