Clean Rooms are environments that must be totally clean. No dust, no dirt, no particulate. The airflow is designed to take microscopic particles down off the body, usually by a grated access floor. These floors are ventilation and the application is highly specialized. The floors are expensive compared with mainframe type raised floors. Clean rooms are typically found in hi-tech environments such as biomedical, microelectronic, pharmaceutical , semi-conductors , telecommunication equipment and laboratory facilities.