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Classes of Fires


There are four classes of fires. All fire extinguishers are labeled, using standard symbols, for the classes of fires on which they can be used. A red slash through any of the symbols tells you the extinguisher cannot be used on that class of fire. A missing symbol tells you only that the extinguisher has not been tested for a given class of fire, but may be used if an extinguisher labeled for that class of fire is not available.

Types of Fires:

  • CLASS A - Ordinary combustibles such as wood, cloth, and paper.
  • CLASS B - Flammable liquids such as gasoline, oil, and oil-based paint.
  • CLASS C - Energized electrical equipment, including wiring, fuse boxes, circuit breakers, machinery & appliances.
  • CLASS D - Combustible metals such as magnesium or sodium.