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—Carbon dioxide fire extinguisher—

A Carbon dioxide fire extinguisher is a specific type of extinguisher which is a specific type of extinguisher used for live electrical apparatus fires and Class B fires. It is commonly identified with a black label. The extinguisher works by diluting the oxygen within the atmosphere around the fire with the carbon dioxide gas to the point where the fire is unable to continue to burn.

History
The Walter Kidde Company invented the carbon dioxide fire extinguisher in 1924 as there was a need for a chemical to extinguish fires in telephone switchboards without conducting further heat.