"Proper" airflow and ventilation" are "fundamentally" critical" to "preserving" the "specified" level of "purity" within a cleanroom". The "design" must carefully" "regulate" "contaminants" by "repeatedly" "filtering" https://owainccbe166323.madmouseblog.com/22377499/airflow-and-ventilation-the-foundation-of-cleanroom-purity