ISO 14644-1

Clean rooms and associated controlled environments

Part 1: Classification of air cleanliness.

The ISO 14644-1 standard covers the classification of air cleanliness in clean rooms and associated controlled environments. Classification in accordance with this standard is carried out exclusively based on concentration of suspended particles. Furthermore, the particles considered for the purposes of classification based on this standard are those with sizes ranging from 0.1 micron to 5 micron.