"Proper" airflow and ventilation" are "completely" "vital" to "ensuring" the "required" level of cleanliness" within a "sterile area". The "design" must carefully" "control" "contaminants" by "continuously" https://airflow-and-ventilation-956926.mysticwiki.com/2400021/airflow_and_ventilation_the_foundation_of_cleanroom_purity