• Air Flow Control

  Clean sheds create specific airflow patterns through a carefully designed arrangement of supply and exhaust air outlets to achieve a unidirectional flow of air that quickly removes microparticles from the shed. This design ensures the cleanliness of the air inside the shed and meets the environmental quality requirements for production or experimentation.

• Air Filtration Technology

  The ventilation system in the clean room utilizes highly efficient air filtration technologies such as HEPA (High Efficiency Particulate Air Filter) or ULPA (Ultra High Efficiency Particulate Air Filter) to capture and remove microscopic particles to ensure air quality.

• Positive Pressure Control Strategy

  In order to prevent the intrusion of external contaminants, clean rooms are usually maintained at a positive pressure. Positive pressure is maintained by fine control of the air supply and return air volume, while ensuring a certain pressure difference, usually 5 to 10 Pa, with the neighboring areas or the outdoors.

• Airflow field design

  Airflow field design is the key to clean room design, involving the form of air supply and return air, the precise control of air speed and air volume, as well as the use of laminar or turbulence effect, in order to achieve the best airflow organization and cleanliness.

Preparation before installation

Before starting the installation of a clean shed, you need to make sure that the installation environment is clean, dust-free and germ-free, and that there is enough space for the installation. In addition, the installer should wear clean clothes and protective shoes, wear a helmet and carry out the installation in a clean room.

Installation steps

• Space preparation: Make sure there is enough space to install the clean shed and try to install it at the air outlet to extend the service life of the filter.

• Environment selection: It is not suitable to be installed in dusty, humid or easily corroded by salt and alkali places.

• Cleaning: Use alcohol to wipe off the accumulated dust on the soft curtain, FFU, frame and plexiglass before installation.

• Structure installation: according to the design drawings, assemble and install the frame and support structure of the clean shed, usually using aluminum alloy profiles to ensure that it is solid and reliable.

• Filter and FFU installation: Installation of high-efficiency filters and connection of FFU fans to ensure air circulation.

• Sealing and door/window installation: Install sealing materials, such as sealing strips, gaskets, etc., around the clean room and the openings such as doors and windows to ensure a good sealing effect.

• Lighting and ventilation equipment installation: according to the use of clean room requirements, install appropriate lighting and ventilation equipment, such as clean lamps and lanterns, explosion-proof lamps and lanterns, exhaust fans, air conditioners and so on.

• System testing and commissioning: after the installation is completed, use professional testing instruments to test the air quality in the clean room to ensure that the cleanliness, temperature, humidity and other parameters meet the requirements.

Precautions

• The installer should have relevant knowledge and skills to operate and install the clean room correctly.

• Choose appropriate filters and other accessories, and replace and maintain them as required.

• Pay attention to the environment in which the clean room is used and avoid the influence of harmful chemicals, high temperature, high humidity and other factors.

• After installation, cleanliness testing, generally using particle counters, measuring data in the "empty" or "static" environment, acceptance work.

Cleanliness Standards for Cleanrooms

The cleanliness of a cleanroom is usually measured in Particles per Cubic Meter (PCM) or Particles per Cubic Foot (PCF). Cleanliness standards vary depending on the industry and application, but here are some general cleanliness standards:

• ISO 14644: This is an international standard that defines cleanliness levels for cleanrooms.The ISO 14644-1 standard specifies particle count limits for various cleanliness levels. For example, an ISO 14644-1 Class 1 cleanroom requires a particle count of no more than 10,000 PCM per cubic meter.

• US Federal Standard 209E: This is a US federal standard that has been superseded by ISO 14644. However, it is still used by some industries to measure the cleanliness of cleanrooms.

• GMP Standards: Good Manufacturing Practice (GMP) standards are commonly used in pharmaceutical manufacturing to specify cleanliness requirements. These standards will be developed for different product types and applications.

Clean room testing programs

Clean room testing items include clean room dust particle count, settled bacteria, planktonic bacteria, differential pressure, ventilation frequency, air velocity, fresh air volume, illumination, noise, temperature, relative humidity, and so on. Testing tools and equipments include particle counter, plankton bacteria sampler, differential pressure meter, anemometer, airflow hood, noise meter, illuminance meter, temperature and humidity meter.

Clean room testing standards

The testing standards of clean room usually refer to national or international standards, such as ISO 14644-1 "Clean Room and Related Controlled Environment Air Cleanliness Levels". Third-party cleanroom testing and acceptance units need to pass the National Laboratory Accreditation Board (CNAS) certification and metrological certification (CMA), the cleanroom test report issued to truly reflect the actual situation of the cleanroom.

Clean room testing process

The testing process of clean room includes several aspects such as preparation before acceptance, on-site inspection, performance testing and document review. The preparation work before acceptance includes the formation of acceptance team, clear acceptance criteria and preparation of acceptance tools and equipment. On-site inspection includes structure and material inspection, air duct and filtration system inspection, lighting and static electricity control inspection. Performance testing includes cleanliness testing, airflow organization testing, differential pressure control, temperature and humidity control. Documentation review includes construction records and drawings verification, equipment and material qualification certificates as well as operation and maintenance manuals and training records.