"Effective" airflow and ventilation" are absolutely" "essential" to "preserving" the "required" level of "sterility" within a "controlled environment". The "design" must "precisely" "control" "dust" by "continuously" https://the-role-of-airflow-in-c629098.wikipresses.com/7668804/airflow_and_ventilation_the_foundation_of_cleanroom_purity