Many pharmaceutical and engineering consulting firms publish "white papers" or "guides to the standard" for free. These summarize the changes (specifically the shift from the 1999 version to the 2015 version regarding statistical sampling methods).
If you want, I can:
: While the 2007 version (ISO 14644-6:2007) is widely cited, it has been officially iso 146446 pdf
Covers procedures for testing airflow, pressure differentials, and filter integrity. Part 4: Design, Construction, and Start-up Provides guidelines on air change rates and structural requirements for new cleanroom facilities. 32352161.s21i.faiusr.com Key Compliance Metrics Particle Concentration: The primary metric for classification based on microns. Environmental Controls: While ISO 14644-1 suggests ranges for temperature ( ) and humidity ( Primary Function
: Cleanrooms and associated controlled environments — Part 6: Vocabulary. Primary Function Part 4: Design