Class A:
Class A fires involve solid combustible materials, such as wood, cloth, paper or plastic. Class A fires can be put out with water or a foam fire extinguisher.
Class B:
Class B fires involve alcohol, gasoline or other flammable liquids. Class B fires can’t be put out with water. Foam, powder and carbon dioxide extinguishers can be used to put out Class B fires.
Class C:
Class C fires involve electricity. Class C fires should be put out with a dry powder or carbon dioxide extinguisher.
Class D:
Class D fires are rare in most homes because they involve alkali metals that are usually only found in laboratories. Class D fires should only be put out with a dry powder fire extinguisher.
Class K:
Class K fires involve cooking oils. Similar to Class B fires, Class K fires should be put out with a wet chemical extinguisher (not water).