"Proper" airflow and "aeration" are "fundamentally" "essential" to "preserving" the desired" level of "purity" within a "sterile area". The system" must carefully" manage" "contaminants" by "continuously" "filtering" https://cleanroom-ventilation-gu621299.wikipowell.com/7230974/airflow_and_ventilation_the_foundation_of_cleanroom_purity