The concentration of suspended particles in the clean room is controlled, and its construction and use method is to minimize the particles that enter, produce, and stay in the room; other indoor parameters, such as temperature, humidity, and air pressure, are controlled as needed. The first half of the definition basically describes what is clean, which is a room that minimizes the entry, generation, and retention of particles. To achieve this, first, a very large amount of supply air must be filtered through a high-efficiency filter. The purpose of this air supply is:

(1)Dilute and remove particles and bacteria emitted by indoor personnel and equipment;

(2) Pressurize the room to ensure that dirty air does not flow into the clean room. Secondly, the building materials of the clean room do not produce particles and are easy to clean. Finally, clean room personnel use clothing to cover their bodies to minimize the particles and microorganisms they emit. These measures and other similar measures to minimize the pollution introduced, generated, and retained using clean rooms. The clean room can also control temperature, humidity, sound, lighting, and vibration. But these characteristics are not exclusive to clean rooms.

The clean room is a modern thing. Although the source of clean room design and management can be traced back to anti-infection measures in hospitals more than 100 years ago. However, the demand for a clean environment in the manufacturing industry was only put forward in modern society. The reason why the manufacturing industry needs a clean room is because people, production equipment, and buildings all produce pollution. As explained, people and equipment can produce millions of particles, and general building materials are also easily broken. But the clean room can control the spread of particles, so that the production can be carried out in a clean environment.

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