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Laboratory Class 7 Clean Shed - Non ESD, Acrylic, Stainless Steel, AC Fans
Temperature and humidity standard of clean room
For 7 clean shed, its requirements for temperature and humidity are not as strict as the requirements for cleanliness. In general, when there is no special temperature and humidity requirements, the temperature control is usually set at 20~22℃ in winter and 24~26℃ in summer, with a fluctuation range of ±2℃; while the humidity control is between 30~50% in winter and 50~70% in summer. Such temperature and humidity settings are designed to provide a comfortable working environment, while also taking into account the microenvironmental requirements of the production process.
Clean room standards for fine particulate matter and microbial tolerances
The cleanliness standards for clean rooms are mainly reflected in the maximum tolerance for fine particles and microorganisms. For a class 7 clean room, the number of particles ≥ 0.5 micron is required to be no more than 3.5 million, while the number of particles ≥ 5 micron is required to be no more than 20,000. In addition, the maximum allowable microbial counts include no more than 500 planktonic bacteria/m³ and no more than 10 settled bacteria/90mm petri dish.
Pressure difference standard of clean room
Pressure difference is a key parameter to ensure that the internal environment of a clean room is free from external contamination. For the same level of clean room between the clean room, the pressure difference should be maintained the same. For different cleanliness levels between neighboring clean sheds, the pressure difference should be maintained at ≥5Pa, and the pressure difference between clean and non-clean sheds should be maintained at ≥10Pa, which is mainly for the effective protection of the gas from the clean area into the non-clean area, to avoid the occurrence of air back-up situation.
Cleanliness level table
Ventilation System
The ventilation system is a central component of a clean room and is responsible for maintaining air flow and reducing airborne particles and other contaminants. The system exhausts unclean air and brings in filtered fresh air. This process is accomplished through highly efficient air filters, usually HEPA (High Efficiency Particulate Air Filters) or ULPA (Ultra High Efficiency Particulate Air Filters). These filters capture and remove tiny particles, ensuring that airborne particulate matter is kept at an acceptably low level.
Air Quality Control
Cleanrooms typically use negative or positive pressure systems to maintain a clean environment by preventing outside air from entering or inside air from escaping. Positive pressure systems mean that the indoor air pressure is higher than the outdoor air, thus preventing the infiltration of contaminated outdoor air; negative pressure systems, on the contrary, are used for contaminant control in specific situations.
Clean Clothing
Operators working in a clean room are usually required to wear special clean suits including helmets, masks, gloves and clothing to minimize contamination brought in by personnel. The design and choice of materials for clean suits is critical to controlling cleanliness within the cleanroom and they are usually made of anti-static materials to prevent static build-up and dust adhesion.
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