How fast can your room return to its target cleanliness after a contamination event? This is critical for cleanrooms that are "at rest" most of the time. The standard defines recovery factors (e.g., 100x, 10x reduction time).
This section destroys the myth of "velocity averaging." Iso 14644-3.pdf
Execute sections B through G of the PDF. Your protocol must include: How fast can your room return to its
| Test Type | Description | |-----------|-------------| | Airflow volume/velocity | 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 section destroys the myth of "velocity averaging
You cannot control what you cannot see.
This tests the structure itself—not the filters. Do you have leaks through wall panels, cable penetrations, or ceiling grids? This test uses a tracer gas (like SF₆) or a liquid curtain to find hidden breaches.
For each test, the standard requires documentation of: