Iso 146443pdf 2021 Jun 2026

The 2019/2021 versions introduced several technical changes to simplify and clarify testing: New Segregation Test

ISO 14644-3:2019 specifies test methods for of cleanrooms and clean zones. It replaces the 2005 version and aligns with updates in ISO 14644-1:2015 (classification) and ISO 14644-2:2015 (monitoring). iso 146443pdf 2021

While ISO 14644-1 defines what "clean" means in terms of particle concentration, Part 3 describes how to measure it and other critical performance parameters. Its scope encompasses various testing methods for both unidirectional and non-unidirectional airflow systems. These tests are typically conducted across three occupancy states: iso 146443pdf 2021