Iso 14644-3.pdf -

ISO 14644-3:2019 provides essential, standardized test methods for evaluating the performance of cleanrooms and controlled environments, including procedures for airflow, filter integrity, and pressure. The 2019 revision updated test methodologies to improve accuracy in measuring contamination control,, specifically addressing filter leak testing and adding segregation tests for critical environments. For detailed information on these test methods, visit ANSI Blog.

The 2019 Update is critical. The version from ISO 2019 supersedes the 2006 edition. Major changes include: Iso 14644-3.pdf

• At-rest tests: No personnel, no process. Just the room.
• Operational tests: Simulated production with maximum personnel.

Apparatus Calibration: All instruments used (particle counters, anemometers, etc.) must be regularly calibrated and traceable to national standards. At-rest tests: No personnel, no process

2. Filter Installation Leak Test (Annex C)

Previously known as the "scanning test." The Iso 14644-3.pdf details two approaches: At-rest tests: No personnel

Key concepts and definitions

• Classification vs testing: ISO 14644-1 sets particle concentration limits; ISO 14644-3 defines the measurement methods used to verify those limits.
• Operational states: Tests are performed in defined operational states (e.g., at-rest, in-operation).
• Test locations: Sample locations are chosen to represent the room uniformly and critical locations (e.g., work zones, product exposure).
• Confidence and uncertainty: Measurement uncertainty and statistical confidence affect sampling and interpretation.