Which fire extinguisher types are appropriate for propane fires?

• A. Water spray extinguishers
• B. Class B (flammable liquid) extinguishers; Class C if electrical hazards are involved
• C. Class A extinguishers only
• D. Class D extinguishers for metal fires

Answer: (B)

Propane fires are fueled fires, so the extinguisher you choose must target flammable fuels. Extinguishers rated for flammable liquids are designed to interrupt the chemical reaction and smother the flame for propane, making them the appropriate first choice. If the fire involves electrical equipment, you also want an extinguisher that is safe to use on energized devices, meaning it has a rating for electrical fires.

Water-based extinguishers aren’t suitable here because water can spread burning propane vapors and won’t reliably stop a propane flame. Extinguishers intended for ordinary combustible materials target materials like wood or paper, not propane, and those for metal fires are meant for metal fires, not propane. So the best option is an extinguisher for flammable liquids, used with electrical hazards in mind if electricity is involved.