Which item is NOT one of the four main classes of fire?

Which item is NOT one of the four main classes of fire?

• A. Paper, Wood, Ordinary Combustibles (White Smoke, Ash)
• B. Liquid
• C. Electric
• D. Gases

Answer: (D)

Fire classifications are based on the type of fuel involved, which guides how you suppress the fire. The four main classes are ordinary combustibles (A) like paper and wood; flammable liquids (B); electrical (C); and combustible metals (D). Gases aren’t listed as one of these four main classes, so the item describing gases isn’t part of the standard set. When you encounter a gas-related incident, you still assess the fuel and apply the appropriate extinguishing approach for that situation, but the training framework you’re using centers on A, B, C, and D.

Fire classifications are based on the type of fuel involved, which guides how you suppress the fire. The four main classes are ordinary combustibles (A) like paper and wood; flammable liquids (B); electrical (C); and combustible metals (D). Gases aren’t listed as one of these four main classes, so the item describing gases isn’t part of the standard set. When you encounter a gas-related incident, you still assess the fuel and apply the appropriate extinguishing approach for that situation, but the training framework you’re using centers on A, B, C, and D.