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Laser products class 7 clean room - non-electrostatic, mesh soft curtain, stainless steel, AC fan
Cleanliness Standards
The cleanliness standard of a clean room is a key indicator of the quality of the air inside it, which determines the extent to which the clean room is able to control and minimize airborne particles. Generally speaking, the cleanliness level of a clean room can be divided into different levels such as Class 5, Class 6, Class 7, etc. These levels reflect the permissible amount of particles within a specific size range in the air inside the clean room. For example, a Class 100 clean shed requires that the number of particles ≥0.5 microns per cubic meter of air does not exceed 350,000, while a Class 7 clean shed allows up to 3.5 million particles of this quantity.
Differential Pressure Standard
Differential pressure is an important consideration in the design of a clean room, which ensures that the direction of air flow is from the clean area to the outside and avoids the backflow of pollutants. The same cleanliness level of the clean shed should maintain a consistent pressure difference between the different cleanliness levels of the neighboring clean shed should be maintained at least between the pressure difference in the 5Pa above, while the clean shed and the pressure difference between the non-clean shed should be not less than 10Pa.
Temperature and humidity
The temperature and humidity of the clean room also have a significant impact on the cleanliness of its internal environment. In general, the temperature in winter is controlled at 20~22℃ and the humidity at 30~50%; in summer, the temperature is controlled at 24~26℃ and the humidity at 50~70%. Such temperature and humidity settings are designed to maintain a stable internal environment that is conducive to controlling the generation and spread of particulate matter.
Cleanliness Classification Table
Air Flow Methods
There are two main types of air flow in the clean room: vertical flow and horizontal flow. Vertical flow refers to the air flow from top to bottom, this way can effectively reduce the particles in the working area of the residence time, improve the cleanliness. Horizontal flow is the parallel flow of air in the working area, which is conducive to maintaining a constant level of cleanliness in the working area.
Ventilation system and filters
Clean rooms are equipped with efficient ventilation systems to maintain air flow and reduce airborne particles and other contaminants. The ventilation system also includes exhaust equipment and devices for introducing fresh filtered air. In addition, the clean room is equipped with high efficiency air filters such as HEPA (High Efficiency Particulate Air) or ULPA (Ultra High Efficiency Particulate Air) filters to capture and remove small particles, ensuring that airborne particulate matter is maintained at an acceptably low level.
Air Quality Control
Clean rooms are usually constructed with negative or positive pressure systems to prevent the entry of unclean air from the outside or the escape of clean air from the inside in order to maintain a clean environment inside.
Clean Clothing
Operators working in a clean room are usually required to wear special clean suits including helmets, face masks, gloves and clothing to minimize contamination from the human body.
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