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Foam fire extinguishersFoam (AFFF) fire extinguishers are more versatile than water and are generally lighter in weight compared with water equivalent. They can be used for Classes A & B fires but are not recommended for fires involving electricity. Foam fire extinguisher are colour coded with a cream label. A foam fire extinguisher discharges a foam solution under pressure that forms a blanket or film on the surface of a burning liquid creating a barrier between the fire vapours and the air necessary to support combustion thereby smothering the fire. How to use a foam fire extinguisher on Class B liquid fires Where the liquid on fire is in a container, direct the spray at the back edge of the container or at an adjoining vertical surface above the level of the burning liquid. This allows the foam to build up and flow across the surface of the liquid to smother the fire.
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