Cylinders not filled on site must be ____ feet from building openings below the relief valve.

Cylinders not filled on site must be ____ feet from building openings below the relief valve.

• A. 1 foot
• B. 6 feet
• C. 9 feet
• D. 3 feet

Answer: (D)

Gas safety hinges on keeping vented propane away from building openings. When cylinders aren’t being filled on site, any gas that escapes through the relief valve can drift toward doors, windows, or other openings. A small, practical buffer helps that gas dissipate rather than seep into a building, reducing the risk of ignition or asphyxiation inside. The required minimum distance is three feet. This distance provides a safe margin for vented gas to disperse and not enter openings located below the relief valve. Distances smaller than that would increase the chance of gas entering openings, while larger distances aren’t necessary for this rule.

Gas safety hinges on keeping vented propane away from building openings. When cylinders aren’t being filled on site, any gas that escapes through the relief valve can drift toward doors, windows, or other openings. A small, practical buffer helps that gas dissipate rather than seep into a building, reducing the risk of ignition or asphyxiation inside.

The required minimum distance is three feet. This distance provides a safe margin for vented gas to disperse and not enter openings located below the relief valve. Distances smaller than that would increase the chance of gas entering openings, while larger distances aren’t necessary for this rule.