Class B fires involve which type of material?

Class B fires involve which type of material?

• A. Flammable Liquids
• B. Electrical equipment
• C. Metals
• D. Wood

Answer: (A)

Fires are categorized by what fuel is burning. Class B refers to flammable liquids. This includes fuels and solvents such as gasoline, jet fuel, oils, and other liquids that release ignitable vapors. The danger with these fires is that liquids can spread and their vapors can ignite readily, so suppressing them relies on blankets or agents that separate the fuel from the air and cool the liquid—for example foam, dry chemical powders, or CO2. Water is generally not ideal for these fires because it can spread the liquid and spread the fire. Other fire types are based on different fuels: electrical equipment-related fires, which involve energized components; metal fires; and ordinary combustibles like wood and paper. Those are treated with different extinguishing strategies appropriate to their fuel.

Fires are categorized by what fuel is burning. Class B refers to flammable liquids. This includes fuels and solvents such as gasoline, jet fuel, oils, and other liquids that release ignitable vapors. The danger with these fires is that liquids can spread and their vapors can ignite readily, so suppressing them relies on blankets or agents that separate the fuel from the air and cool the liquid—for example foam, dry chemical powders, or CO2. Water is generally not ideal for these fires because it can spread the liquid and spread the fire.

Other fire types are based on different fuels: electrical equipment-related fires, which involve energized components; metal fires; and ordinary combustibles like wood and paper. Those are treated with different extinguishing strategies appropriate to their fuel.