Air Change Requirements for Cleanrooms
2024.07.19
Air Change Requirements for Cleanrooms
The clean air environment inside a cleanroom is achieved through the circulation and filtration of internal airflow. Different cleanliness levels require varying air change rates, with higher cleanliness levels necessitating more frequent air changes within a given time frame. In the design of HVAC purification systems for cleanroom projects, purification engineers need to determine a reasonable air change rate according to the standards, and then calculate the required circulation air volume, exhaust air volume, fresh air volume, and other parameters to select the appropriate equipment. Therefore, determining the air change rate for a cleanroom is a crucial design basis.
ISO Class | Cleanroom Class (Federal Standard) | Air Changes per Hour (ACH) | Application Fields | Notes |
ISO 1 | Class 1 | 500-750 | Semiconductor manufacturing, nanotechnology research, etc. requiring extremely high cleanliness | Extremely high cleanliness, suitable for the most stringent environments |
ISO 2 | Class 2 | 500-750 | Semiconductor manufacturing, nanotechnology research, etc. requiring extremely high cleanliness | Extremely high cleanliness, suitable for the most stringent environments |
ISO 3 | Class 10 | 300-540 | High-precision electronics manufacturing, biopharmaceutical research, etc. requiring high cleanliness | High cleanliness, suitable for high-precision work environments |
ISO 4 | Class 100 | 150-240 | Medical device manufacturing, precision instrument assembly, etc. requiring high cleanliness | Suitable for industrial production requiring high cleanliness |
ISO 5 | Class 1,000 | 60-90 | Pharmaceutical industry, laboratories, food processing, etc. requiring medium to high cleanliness | Common in pharmaceutical and laboratory environments |
ISO 6 | Class 10,000 | 35-60 | General manufacturing, electronic assembly, etc. requiring medium cleanliness | Suitable for general manufacturing and assembly |
ISO 7 | Class 100,000 | 10-25 | General manufacturing, food industry, packaging workshops, etc. requiring low cleanliness | Common in food and packaging industries |
ISO 8 | - | 5-10 | General warehousing, ordinary industrial workshops, etc. requiring the lowest cleanliness | Lowest cleanliness requirements, suitable for non-critical environments |
The data and notes in the table provide clear guidance for the design and application of cleanrooms at various cleanliness levels. Ensuring a reasonable air change rate is an essential step in designing cleanroom HVAC systems to ensure that the cleanroom meets the expected air quality standards during operation.
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