What is considered a toilet room in mechanical code?

A toilet room, as defined in the mechanical code, is a space specifically designated for the installation of a water closet and a lavatory. This configuration allows for essential hygiene practices, where the water closet provides the necessary sanitary facilities and the lavatory offers a sink for handwashing, thereby ensuring compliance with health and safety standards.

Options that include other arrangements, such as a bathtub or only a lavatory, do not meet the specific criteria of what constitutes a toilet room in this context. The inclusion of a water closet alongside a lavatory expresses the fundamental purpose of a toilet room: to provide both sanitary disposal and handwashing facilities within the same enclosed space. Thus, this particular arrangement is emphasized as the standard for defining a toilet room in mechanical systems codes.