Which action sequence is recommended during an indoor propane leak?

• A. Evacuate, ventilate, and eliminate ignition sources.
• B. Ventilate only.
• C. Seal the area and wait.
• D. Use a flame to locate the leak.

Answer: (B)

Propane indoors creates a flammable mixture that can ignite if a spark is present, so the fastest way to reduce the danger is to dilute and disperse the gas. Ventilating the area by opening doors and windows moves fresh air through the space, lowers the vapor concentration, and minimizes the chance of ignition. Actions like sealing the area and waiting can trap gas, and using a flame to locate the leak can introduce a spark, both of which are dangerous. So the key safety move is to ventilate to reduce the gas concentration quickly and safely.