What are the Determining Factors Involved in Choosing the Classification of a Cleanroom?
1.Air supply cleanliness
Air supply cleanliness To ensure that the cleanliness of the air supply meets the requirements, the key is to clean the performance and installation of the final filter of the system. In view of the cleanliness requirements, the low-grade clean room is selected as a low-performance filter, and the high-grade clean room is selected as a high-performance filter. In fact, to choose a good filter, we must fully consider the clean room characteristics, filter characteristics and purification system characteristics. To ensure the cleanliness of the air supply, only qualified filters are not enough, but also to ensure that: a. transportation, installation process does not damage the filter; b. tight installation。
The airflow organization of the clean room is different from that of a general air-conditioned room. It requires that the cleanest air be sent to the operating site first. Its function is to limit and reduce the pollution of the workpiece.
3.Air delivery and speed
Sufficient ventilation is to dilute and eliminate indoor polluted air. According to different cleanliness requirements, when the clean room height is high, the number of air changes is appropriately increased.
4.Static pressure difference
Maintaining a certain positive pressure in the clean room is one of the essential conditions to ensure that the clean room is not or less contaminated to maintain the design cleanliness level. Even in a vacuum chamber, it must have a positive pressure in an adjacent room or suite that is not below its cleanliness level, and the cleanliness of the vacuum chamber can be maintained.