Air Changes per Hour (ACH) and Cleanroom Classification
2024.08.02
Air Changes per Hour (ACH) and Cleanroom Classification
Air changes per hour (ACH) measure how often the cleanroom’s air volume is replaced in one hour, which directly impacts the cleanliness level. Here’s a concise overview of ACH requirements across different cleanroom classes:
International Cleanroom Classification and ACH Requirements
Cleanroom Class | ACH |
ISO Class 1 | ≥ 500 ACH |
ISO Class 2 | ≥ 250 ACH |
ISO Class 3 | ≥ 100 ACH |
ISO Class 4 | ≥ 70 ACH |
ISO Class 5 | ≥ 30-60 ACH |
ISO Class 6 | ≥ 20-40 ACH |
ISO Class 7 | ≥ 10-30 ACH |
ISO Class 8 | ≥ 5-20 ACH |
ISO Class 9 | ≥ 5 ACH |
Key Insights:
- Higher Cleanroom Classes (ISO Class 1-5)
:
- Lower Cleanroom Classes (ISO Class 6-9)
:
- Dynamic vs. Static Conditions
:
- GMP Considerations
:
Conclusion:
The ACH required for a cleanroom is crucial for maintaining its cleanliness level and efficiency. This overview provides a general guideline, but exact requirements should be tailored to specific industry standards and operational conditions.
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