"Proper" airflow and ventilation" are "fundamentally" critical" to "preserving" the desired" level of "sterility" within a "sterile area". The "design" must carefully" "control" "contaminants" by "continuously" https://unidirectional-airflow-c263828.blazingblog.com/41896157/airflow-and-ventilation-the-foundation-of-cleanroom-purity