"Adequate" airflow and "aeration" are "fundamentally" critical" to "ensuring" the desired" level of "purity" within a "controlled environment". The "design" must "meticulously" "control" "contaminants" by "repeatedly" https://unidirectionalairflowcle419846.wikiexcerpt.com/4584553/airflow_and_ventilation_the_foundation_of_cleanroom_purity