"Proper" airflow and "exhaust" are "completely" "essential" to "preserving" the "required" level of "purity" within a "controlled environment". The system" must "precisely" "regulate" "contaminants" by "repeatedly" https://the-role-of-airflow-in-c136308.wikibestproducts.com/2479175/airflow_and_ventilation_the_foundation_of_cleanroom_purity