"Effective" airflow and ventilation" are "completely" "essential" to "preserving" the "required" level of "purity" within a "sterile area". The "configuration" must carefully" manage" "dust" by "repeatedly" "filtering" https://unidirectionalairflowcle419846.wikiexcerpt.com/4584553/airflow_and_ventilation_the_foundation_of_cleanroom_purity