Clean room refers to a certain space within the scope of the air in the microparticles, harmful air, bacteria and other pollutants excluded, and will be the indoor temperature, cleanliness, indoor pressure, air velocity and airflow distribution, noise and vibration, and lighting, static electricity control within the scope of one of the needs of a specially designed room, which is also regardless of the external air conditions how to change the rate of the rate of temperature can be set in Witte's original requirements for the cleanliness, temperature and humidity, and pressure, and other performance.
Classification by Usage
Industrial clean room: To the control of inanimate particles as the object. The main control of air dust particles on the work object of pollution, the internal generally maintain a positive pressure state. It applies to precision machinery industry, electronics industry (semiconductors, integrated circuits, etc.), computer hard disk, computer magnetic head production and other industries.
Biological clean room: To control the living particles (bacteria) and inanimate particles (dust) on the work object pollution. Can be divided into:
- General biological clean room: the main control of microorganisms (bacteria) contamination of the object. At the same time, its internal materials to be able to withstand a variety of sterilization agent erosion, the internal generally maintain a positive pressure.
- Biological safety clean room: the main control of the work object of the living particles of the outside world and human contamination. Negative pressure with the atmosphere should be maintained inside.
Classification by Airflow
- Unidirectional flow clean room (laminar flow, piston flow)
- Turbulent flow clean room
- Radiation flow (oblique flow) clean room
- Mixed flow clean room (turbulent flow and laminar flow together)