What type of fire extinguisher is specified for use during a minor spill response upwind?

• A. Water
• B. Foam-type or Halon-type
• C. CO2
• D. Dry chemical

Answer: (B)

When handling a minor flammable-liquid spill, you want an extinguisher that can rapidly suppress vapors and provide a protective blanket over the liquid without simply pushing vapors around. Foam-type extinguishers or Halon-type extinguishers fit that need, especially when used upwind. Foam forms a stable surface layer that blankets the spill, cools the liquid, and minimizes vapor release, which helps prevent ignition. Halon works quickly by interrupting the flame’s chemical reactions and displacing some air, giving fast control of the fire, which is useful in tight or sensitive areas where water isn’t appropriate. Using the agent upwind keeps you out of the path of rising vapors while the blanket or gas suppresses the hazard downwind.

Water would spread the flammable liquid and potentially spread the fire; CO2 can drift away from the spill and is less effective for outdoor vapors, and dry chemical, though versatile, leaves residue and isn’t as well suited for creating a vapor-suppressing blanket over a spill.