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A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations

There are four classes of fire extinguishers – A, B, C and D – and each class can put out a different type of fire.

  • Class A extinguishers will put out fires in ordinary combustibles such as wood and paper
  • Class B extinguishers are for use on flammable liquids like grease, gasoline and oil
  • Class C extinguishers are suitable for use only on electrically energized fires
  • Class D extinguishers are designed for use on flammable metals
  • A Class K fire extinguisher uses a fine wet mist consisting of an alkaline mixture, such as potassium acetate, potassium carbonate, or potassium citrate that forms a soapy foam as it is applied to the cooking oil or other substance, quenching the steam, vapors, and the fire's risk of re-ignition.
Multipurpose extinguishers can be used on different types of fires and will be labeled with more than one class, like A-B, B-C or A-B-C.
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