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class 5 Electronic clean room-Anti-static, acrylic, aluminum profile, AC fan
The purification standards for a Class 7 clean room involve the following key indicators:
Dust particle limit
Number of particles greater than or equal to 0.5 microns: not to exceed 3.5 million per cubic meter.
Number of particles greater than or equal to 5 microns: must not exceed 20,000 per cubic meter.
Microorganism Limits
Number of planktonic bacteria: not to exceed 500 per cubic meter of air.
Number of settled bacteria: not to exceed 10 per petri dish.
Temperature and Humidity Control
Temperature: Recommended to be controlled between 18 and 24°C.
Relative humidity: Recommended control between 45% and 65%.
Air changes
The number of air changes per hour is usually required to be between 18 and 25.
Pressure differences
Consistent pressure differentials should be maintained between clean rooms of the same cleanliness level, with pressure differentials of more than 5 Pa between clean rooms of different cleanliness levels and more than 10 Pa between clean rooms and non-clean rooms.
In the implementation of 100,000 clean shed construction and maintenance, but also need to pay attention to the following details:
Material selection: building materials, decorative materials and clean equipment should choose those materials that do not produce too much dust and odor to avoid secondary air pollution.
Air flow: Air flow should be smooth and without dead space, usually using one-way flow or vertical flow, and meet the requirements of proper air supply and exhaust volume, pressure difference, air flow, etc.
Other requirements: including fire prevention, anti-static, radiation protection, sterilization and other requirements, the relevant standards are "GB50016-2014 Code for Fire Protection Design of Buildings", "GB/T 12476.5-2010 to meet certain standards of air cleanliness of the ground and the human body anti-static specifications" and so on.
Cleanliness level table
Clean room working principle
The core working principle of a clean room is its air filtration system and positive pressure control mechanism. Through a highly efficient ventilation system, the clean room is able to maintain a clean environment by continuously delivering fresh filtered air and removing contaminated air.
Air Filtration System
The filtration system in a clean room typically consists of a primary filter, a medium filter and a high efficiency filter (HEPA or ULPA), which work in tandem to capture and remove small particles from the air to ensure air quality.
Positive Pressure Control
Positive pressure control is another key function of a clean room, it ensures that the supply air volume is greater than the sum of the return air volume and the exhaust air volume, so as to maintain a certain positive pressure difference inside the clean room with respect to the external environment as well as between areas of different cleanliness levels, usually the static pressure difference with the outside should not be less than 10 Pa. Such a setup prevents the outside contaminants from entering the clean room through the gaps and openings.
Importance of positive pressure in clean room
Positive pressure control not only ensures the cleanliness of the environment inside the clean room, but also helps to maintain the environmental stability of the entire clean area. The correct setting of the positive pressure value has a direct impact on the effectiveness of the cleanroom, so the relevant norms and standards need to be strictly adhered to in the design and use process.
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