What is the primary purpose of having a floor drain in a shower room?

The primary purpose of having a floor drain in a shower room is to prevent flooding. In environments where water is frequently present, such as a shower room, it is essential to manage water effectively to avoid the accumulation of standing water, which can lead to flooding. The floor drain acts as a safety measure, allowing excess water to flow away quickly, thus maintaining a dry and safe environment.

While the other options reference important drainage functions, such as dealing with condensation and the movement of grey water or plumbing waste, they do not directly address the immediate concern of excess water accumulation that can occur during and after a shower. The design of the shower room, including the placement of the floor drain, primarily aims to facilitate effective drainage and prevent water damage or slipping hazards.