According to industry standards, the five kinds of general fire situations are:
Class A – fires involving ordinary combustibles such as wood, paper, cloth, rubber, and many plastics.
Class B – fires involving flammable liquids such as gasoline, petroleum greases, tars, oils, oil-based paints, solvents, alcohols. Class B fires also include flammable gases such as propane and butane. Class B fires do not include fires involving cooking oils and grease.
Class C – fires involving energized electical equipment such as computers, servers, motors, transformers, and appliances. Remove the power and the Class C fire becomes one of the other classes of fire.
Class D – fires involving combustible metals such as magnesium, titanium, zirconium, sodium, lithium, and potassium.
Class K – fires involving cooking oils and greases such as animal and vegetable fats.
Some types of fire extinguishing agents can be used on more than one class of fire.

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