"Effective" airflow and ventilation" are "completely" "essential" to "ensuring" the "required" level of "purity" within a cleanroom". The system" must "precisely" "control" "contaminants" by "repeatedly" "exchanging" https://the-role-of-airflow-in-c136308.wikibestproducts.com/2479175/airflow_and_ventilation_the_foundation_of_cleanroom_purity