Laser products class 7 clean room - anti-static, mesh soft curtain, aluminum profile, AC fan
The cleanliness level of a clean room is usually classified by the concentration of particles in the air, which is the number of particles above a specific size in a unit volume of air. The main standards for clean room cleanliness levels are ISO 14644-1 and International Federal Standard 209E.
ISO 14644-1 Standard
The ISO 14644-1 standard divides cleanliness into nine classes from ISO 1 to ISO 9. The ISO 1 class has the highest level of cleanliness and the ISO 9 class has the lowest level of cleanliness. For example, ISO 1 requires no more than 10 dust particles larger than 0.1 μm in diameter per cubic meter of air, while ISO 9 allows up to 352,000 such particles per cubic meter.
US Federal Standard 209E
US Federal Standard 209E categorizes cleanliness classes from Class 1 to Class 9. This standard has been superseded by ISO 14644-1, but is still used in some industries. For example, Class 1 requires no more than 100 dust particles larger than 0.5 μm in diameter per cubic foot of air, while Class 9 allows up to 352,000 such particles per cubic foot.
Cleanliness Classification Chart
Air Filtration
Air filtration is one of the most basic functions of a cleanroom. Cleanrooms are usually equipped with high-efficiency air filters inside that intercept and remove microscopic particles and contaminants from the air. For example, HEPA filters capture most particles larger than 0.3 microns in diameter, while ULPA filters are more efficient at capturing smaller particles. The use of these filters ensures that the air entering the interior of the clean room meets a predetermined level of cleanliness.
Positive Pressure Control
Positive pressure control is another key technology in clean rooms. In order to prevent outside contaminants from entering the cleanroom, the cleanroom must maintain a higher pressure than the surrounding environment. This is achieved through a forced-air system that delivers filtered, high-cleanliness air into the shed, creating a constant airflow that prevents the intrusion of outside contaminants. In addition, the positive pressure helps to keep the temperature and humidity inside the shed stable, providing a favorable environment for sensitive manufacturing activities.
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