The standard applies to all cleanrooms and clean zones, regardless of industry—pharmaceuticals, semiconductors, biotechnology, medical devices, or aerospace.
ISO 14644 is a series of international standards developed by the International Organization for Standardization (ISO). It establishes the classification of air cleanliness by particle concentration, as well as the monitoring and testing methods required to maintain that cleanliness. iso 146446 pdf
Before the introduction of ISO 14644 in 1999, the most common standard was the US Federal Standard 209E (which introduced the familiar "Class 100," "Class 1,000" terminology). ISO 14644 has effectively replaced Federal Standard 209E globally, harmonizing cleanroom classifications into a single metric: ISO Class 1 through ISO Class 9. The standard applies to all cleanrooms and clean
The first edition of ISO 14644-6 was published in 2007. However, the critical version you need in your ISO 14644-6 PDF download is ISO 14644-6:2020. Before the introduction of ISO 14644 in 1999,
Key changes in the 2020 revision:
| Feature | ISO 14644-6:2007 | ISO 14644-6:2020 | | :--- | :--- | :--- | | Focus | General principles | Quantitative metrics and benchmarking | | HVAC Approach | Static air change rates | Dynamic, demand-based control | | Energy Metrics | Basic guidance | Formal EnPIs (SCE, SEF) | | Annexes | Limited | Expanded case studies (semiconductor, hospital pharmacies) |
The 2020 version explicitly acknowledges that "one size fits all" airflow designs are obsolete. It encourages the use of automation and real-time sensors to reduce energy during idle periods—a practice known as "occupied/unoccupied mode" operation.