Gas piping must not enter a building in which manner?

• A. Overhead
• B. Above ground
• C. Underground
• D. Through windows

Answer: (C)

Gas piping must not enter a building through windows because this method poses significant safety risks. Windows are openings meant for ventilation and natural light, not for transferring gas lines. Allowing gas piping through a window could lead to a higher chance of gas leaks, which increases the risk of fire or explosion if there were a rupture or malfunction. Additionally, gas piping should be securely installed and protected from damage, which is not possible when using windows as entry points.

In contrast, gas piping can safely enter a building overhead or above ground when properly secured and protected. Underground piping is also permissible when installed according to local code requirements and safety standards, as it minimizes interference with daily activities and is less exposed to environmental damage. Thus, the choice of entering through windows is particularly problematic and raises serious safety concerns.