More expensive than water, but more versatile. Used for Classes A & B fires. Foam spray extinguishers are not recommended for fires involving electricity, but are safer than water if inadvertently sprayed onto live electrical apparatus. Though these are more flexible but costly than water fire extinguishers. You can use them on Class A & B fires but not on fires associated with electricity. They can be safer than water based varieties if accidentally sprayed onto any operating electrical device.
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