"Proper" airflow and ventilation" are absolutely" "vital" to "preserving" the desired" level of "purity" within a cleanroom". The system" must carefully" "control" "contaminants" by "repeatedly" "filtering" the air" https://the-role-of-airflow-in-c425764.shopping-wiki.com/10089061/airflow_and_ventilation_the_foundation_of_cleanroom_purity