Carpentry Level 1 Practice Exam 2026 – Complete Prep Resource

Fires involving flammable liquids and gases are categorized as Class B. This grouping focuses on the type of fuel feeding the fire, which guides the best extinguishing approach. Water is usually not suitable for Class B fires because it can spread the liquid or cause it to float and keep burning. Instead, extinguishing methods like foam, dry chemical powders, or CO2 are used to interrupt the flame without spreading the fuel. Other classifications include Class A for ordinary combustibles (wood, paper), Class C for energized electrical equipment, and Class D for combustible metals. So, the correct category for flammable liquids and gases is Class B.