Which specific test methodology (like or airflow mapping ) do you need the exact technical steps for? Share public link
Tests are conducted across :
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An aerosol challenge (such as PAO or DOP) is introduced upstream of the filter. The downstream face of the filter is then systematically scanned using an aerosol photometer or a discrete particle counter (DPC).
Procedures for collecting air samples to assess microbial contamination. This involves using various types of samplers and culture media. Which specific test methodology (like or airflow mapping
| Aspect | ISO 14644‑3:2005 | ISO 14644‑3:2019 | |---|---|---| | | “Optional tests” | “Supportive tests” | | Segregation test | Not present | New — added to assess containment between zones | | Test methods | Some procedures were complex | Revised, simplified and clarified | | Annex structure | Informative annexes for test methods | Restructured for better usability |
The test can be performed using either a (aerosol photometer) or a light scattering airborne particle counter (LSAPC) , with the two methods described as alternatives in the standard. Before performing the leakage scan, a preliminary airflow velocity test is required to ensure the filter is operating under design conditions. If you share with third parties, their policies apply
| 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. |
This is arguably the most critical test in the standard. The installed filter system leakage test verifies that HEPA or ULPA filters are properly installed and free from bypass leaks, pinholes, or seal defects that could allow unfiltered air to enter the cleanroom.