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Fire Classes Guide

Fires are classed according to the material that is burning. The fire extinguishers provided need to be appropriate for that class of fire. The chart below describes the different classes of fire.

Electricity is not now classified as a class of fire as it is considered a cause of fire rather than a fuel. Once the electrical power is turned off or fused out it becomes a normal fire. Extinguishers such as CO2 (carbon dioxide) are classified as safe for use on electrical fires. It goes without saying, water should NEVER be used on an electrical fire.

Fire Classes

Fire Classes Explained

It can be confusing to choose the correct fire extinguishers needed. We have compiled a list of the fire classes below and the types of fire they relate to in order to help you select the correct products. If you require any help regarding the correct type of fire extinguisher needed please do not hesitate to contact us.

Class A:

Fires involving solid, usually carbon-based materials, which burn with glowing embers, such as wood, paper or textiles.

Class B:

Fires involving flammable liquids, such as petrol, diesel or oils.

Class C:

Fires involving gases such as butane or methane.

Class D:

Fires involving metals such as swarf or magnesium.


Fires involving electrical such as computers or machinery.

Class F:

Fires involving cooking fats and oils, such as would be found in deep fat fryers.