| | 2015 Edition | 2019 Edition | | :--- | :--- | :--- | | Filter Leak Test | Allowed alternative "large leak" methods. | Removed ambiguities; re-emphasized full-scanning with discrete particle counters. | | Airflow Visualization | Basic description. | Expanded annex with guidance on non-intrusive smoke generation and video documentation. | | Test Instrumentation | Referenced generic requirements. | Added specific performance criteria for instruments (e.g., particle counter false count rate). | | Report Requirements | Minimal. | Mandates specific data fields: uncertainty of measurement, environmental conditions during test. |
The International Organization for Standardization (ISO) has established a series of standards for cleanrooms, which are controlled environments used in various industries such as pharmaceuticals, biotechnology, and electronics. One of the key standards in this series is ISO 14644-3:2005, which provides guidelines for the testing and certification of cleanrooms. In this article, we will explore the significance of ISO 14644-3:2005 and its role in ensuring the quality and reliability of cleanroom environments. Iso 14644-3.pdf
| Test Type | Description | |-----------|-------------| | | Measures average velocity (unidirectional flow) or air change rate (non-unidirectional flow). | | Airflow uniformity | Checks variation in velocity across a filter face or terminal. | | Airflow visualization | Smoke or tracer gas to observe airflow patterns, turbulence, or dead zones. | | | 2015 Edition | 2019 Edition |
This section destroys the myth of "velocity averaging." | Expanded annex with guidance on non-intrusive smoke
It is essentially a cookbook of standardized test methods. Without Part 3, two different engineers could test the same room and get completely different results because they used different sampling rates, different probe angles, or different counting methods. Part 3 removes that ambiguity.