Below is a list of Modular Clean Rooms manufacturers from Rancho Santa Margarita, California. A modular clean room is a clean room that is assembled on site from pre-cut components. Modular clean rooms are considered more cost effective than other clean rooms because of their basic construction and low-cost materials. These rooms can be purchased as a kit or installed by a technician. As with standard clean rooms, modular clean rooms are defined as seriously controlled environments.