"Adequate" airflow and ventilation" are absolutely" critical" to "preserving" the "specified" level of "purity" within a "sterile area". The "configuration" must "meticulously" "control" "dust" by "repeatedly" https://cleanroomventilationguid544482.wikiitemization.com/5976903/airflow_and_ventilation_the_foundation_of_cleanroom_purity