The previous version (2000) relied heavily on a rigid statistical formula for re-testing frequencies. The 2015 revision marked a paradigm shift toward a .
: Establishing thresholds that trigger corrective actions before a cleanroom falls out of compliance. 32352161.s21i.faiusr.com +1 Difference Between Part 1 and Part 2 Feature ISO 14644-1 ISO 14644-2 Primary Focus Classification of air cleanliness Monitoring for continued compliance When Applied During design, construction, and initial startup During routine operations and maintenance Key Output Cleanroom Class (e.g., ISO Class 5, 7, or 8) Monitoring data and requalification reports For those looking for the full technical specifications, the official iso 14644 2 pdf