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Fire Class Definition

Class A

Class A fires involve materials such as cloth, rubbish, plastics, wood, or paper.

Class B

Class B fires involve liquids or gases such as paints, fuel oils, and fuel products. Grease fires and cooking oil fires are not included in this class.

Class C

Class C fires involve electrically powered appliances and devices, such as appliances, power transformers, and other electrical machinery or equipment. Absent electricity, these would be other classes of fire.

Class D

Class D fires are involve combustible metals such as aluminum, magnesium, potassium or sodium.

Class K

Class K fires are involve cooking oils and grease, including vegetable and animal fats.

Cold discharge reduces heat while carbon dioxide chemically blocks oxygen fuel in use of carbon dioxide fire extinguishers. Carbon dioxide extinguishers are well suited to class B and C fires, and usually ineffective for class A fires.