According to NFPA 58 combustible materials must not be present:

• A. Within 10 ft of a propane container
• B. Within 25 ft of a propane container
• C. Within 5 ft of a propane container
• D. Within 15 ft of a propane container

Answer: (A)

NFPA 58 requires a protective clearance around propane containers to reduce the chance that nearby combustibles catch fire if there’s a leak or during a fire. The minimum distance specified is ten feet. Keeping at least ten feet between the tank and anything combustible helps prevent ignition from radiant heat, flames, or incidental sparks, and gives space for safe operation and emergency response. If materials are closer than that, they’re within a zone where a fire or heat could more easily reach them, increasing risk. So the proper practice is to maintain at least ten feet of clearance from combustible materials around a propane container.