What is the maximum size pipe that can be supported by drilling holes in the metal pan ceiling?

The maximum size pipe that can be supported by drilling holes in a metal pan ceiling is determined by code specifications and structural integrity considerations. In this case, the correct choice reflects the guidelines that restrict the size of the pipe due to potential impacts on the ceiling's support and structural performance.

For most building codes, drilling holes in metal pan ceilings can weaken their structural integrity if the holes are too large or too numerous. Smaller diameter pipes, like a 1-inch pipe, usually have minimal impact on the overall support structure, thus making it permissible to drill holes for them. Larger pipes, on the other hand, may create more significant alterations in load distribution, which could lead to safety concerns. Consequently, the guidelines prohibit larger pipe sizes, emphasizing the importance of maintaining the ceiling's strength.

This understanding aligns with standard practice and regulations for ensuring fire safety and structural stability within buildings, which is critical for sprinkler systems that rely on robust support structures.