This part of ISO 14644 coversThe classification of air cleanliness in cleanrooms and associated controlled environments exclusively in terms of concentration of airborne particles. Only particle populations having cumulative distributions based on threshold (lower limit) sizes ranging from 0,1 um to 5 um are considered for classification purposes.
EN ISO 14644-1:1999 history
2015EN ISO 14644-1:2015 Cleanrooms and associated controlled environments - Part 1: Classification of air cleanliness by particle concentration (ISO 14644-1:2015)
1999EN ISO 14644-1:1999 Cleanrooms and Associated Controlled Environments - Part 1: Classification of Air Cleanliness