"Adequate" airflow and "aeration" are "fundamentally" "vital" to "preserving" the "specified" level of cleanliness" within a "sterile area". The "design" must carefully" "control" particles" by "repeatedly" "filtering" https://airflow-and-ventilation-956926.mysticwiki.com/2400021/airflow_and_ventilation_the_foundation_of_cleanroom_purity