How to test whether a clean room meets the requirements
To prove that a clean room works satisfactorily, it must be proved that it meets the requirements of the following criteria:
1. The air supply in the clean room is sufficient to dilute or eliminate the pollution generated in the room.
2. The air in the clean room flows from the clean area to the area with poor cleanliness, the flow of contaminated air is minimized, and the air flows in the correct direction at the door and in the indoor building.
3. The air supply in the clean room will not significantly increase the pollution in the room.
4. The movement state of the indoor air can ensure that there is no high concentration gathering area in the closed room.
If the clean room meets the requirements of the above criteria, its particle concentration or microbial concentration (if necessary) can be measured to determine whether it meets the specified clean room standards.
Testing of clean rooms:
1. Air supply and exhaust volume: If it is a turbulent clean room, then its air supply and exhaust volume must be measured. If it is a unidirectional clean room, its wind speed must be measured.
2. Airflow control between zones: To prove that the direction of airflow between zones is correct, that is, it flows from the clean area to the area with poor cleanliness, it is necessary to test: (1) the pressure difference between zones is correct; (2) the direction of airflow at the door or openings on the wall, floor, etc. is correct, that is, it flows from the clean area to the area with poor cleanliness.
3. Filter leak detection: The high-efficiency filter and its outer frame must be inspected to ensure that suspended pollutants do not penetrate through: (1) damaged filters; (2) the gap between the filter and its outer frame; (3) other parts of the filter device and invade the room.
4. Isolation leak detection: This test is to prove that suspended pollutants do not penetrate the building materials and invade the clean room.
5. Indoor airflow control: The type of airflow control test depends on the airflow pattern of the clean room - whether it is turbulent or unidirectional. If the clean room airflow is turbulent, it must be verified that there are no areas in the room where the airflow is insufficient. If it is a unidirectional clean room, it must be verified that the wind speed and wind direction in the entire room meet the design requirements.
6. Suspended particle concentration and microbial concentration: If the above tests meet the requirements, the particle concentration and microbial concentration (when necessary) are finally measured to verify that they meet the technical requirements of the clean room design.
7. Other tests: In addition to the above pollution control tests, one or more of the following tests may also be required: