What do ratings on fire extinguishers mean?

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All extinguishers capable of extinguishing class A and B fires carry a Fire Rating which is indicated by a number and letter. The number indicates the size of fire it can extinguish under test conditions so the larger the number, the larger the fire it can extinguish. The letter indicates the fire classification as above. Some extinguishers like Dry Powder for example carry both a class A and class B rating because of the properties of the extinguishing agent.
The classes are listed below:

Class A - Suitable for organic solids like paper and wood
Type of fire extinguisher - Water, Foam, Dry Powder, Wet Chemicals

Class B - Suitable for flammable liquids
Type of fire extinguisher - Foam, Dry Powder, CO2

Class C - Suitable for flammable gasses
Type of fire extinguisher - Dry Powder

Electrical Risk - Suitable for electrical equipment
Type of fire extinguisher - Dry Powder, CO2 Gas

Class F - Suitable for cooking oil and fat
Type of fire extinguisher - Wet Chemical

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