Which of the following is NOT considered a confined space?

A confined space is characterized by having limited openings for entry and exit, being large enough for a person to enter, and not being designed for continuous occupancy. In this context, an operational control room does not fit the criteria for a confined space.

Unlike a manhole cover, anaerobic digester, or lift station wet well, which have restricted entrances and can pose hazards such as limited ventilation or hazardous atmospheres, an operation control room is typically designed for comfort and safety. It allows for easy access and egress, ensuring that personnel can enter and exit freely without the risks associated with confined spaces, such as toxic fumes or difficult escape routes. Thus, it is the environment least associated with the dangers of confined space work.