The selection and distribution of fire extinguishers must reflect the type and class of fire hazards associated with a particular workplace.

• Class A. Extinguishers for protecting Class A hazards may be selected from the following types: water, foam, loaded stream, or multipurpose dry chemical.
• Class B. Extinguishers for protecting Class B hazards may be selected from the following types: Halon 1301, Halon 1211, carbon dioxide, dry chemicals, foam, or loaded stream.
• Class C. Extinguishers for protecting Class C hazards may be selected from the following types: Halon 1301, Halon 1211, carbon dioxide, or dry chemical.
• Class D. Combustible metal fires are considered Class D hazards. These fires pose a different type of problem in the workplace. Extinguishers using water, gas, or certain dry chemicals cannot extinguish or control this type of fire.
• Class K. Combustible cooking media (vegetable or animal oils and fats) and cooking appliances are considered Class K hazards. Extinguishers for protecting Class K hazards include wet chemical extinguishers.