"Proper" airflow and "aeration" are "completely" "essential" to maintaining" the "required" level of cleanliness" within a "controlled environment". The "design" must "meticulously" "control" particles" by https://the-role-of-airflow-in-c719623.scrappingwiki.com/2458793/airflow_and_ventilation_the_foundation_of_cleanroom_purity