A cleanroom is a controlled environment where products are manufactured. It’s a room in which the concentration of airborne particles is controlled to specified limits, eliminating sub micron airborne contamination. These contaminates are generated by people, process facilities and equipment. They must be continually removed from the air, the levels which these particles need to be removed depends on the standards required. The only way to control contamination is to control the total environment. Airflow rates and direction, pressurization, temperature and humidity all need to be tightly controlled.