The distance that gas piping must be purged from building openings is ______ feet.

Gas piping must be purged a distance of 10 feet from building openings to ensure safety and prevent the risk of gas accumulation near entry points. This distance helps to mitigate potential hazards associated with gas leaks, as gas can migrate into buildings and create an explosive atmosphere if it ignites. The 10-foot distance is standardized to provide a safe buffer from areas where people frequently enter and exit, helping to protect occupants from the dangers associated with gas escapes. Following this guideline is essential for maintaining safety protocols in gas piping installations.