"Effective" airflow and "aeration" are "completely" "essential" to maintaining" the "specified" level of "purity" within a "sterile area". The "design" must "precisely" "regulate" particles" by "continuously" https://the-role-of-airflow-in-c136308.wikibestproducts.com/2479175/airflow_and_ventilation_the_foundation_of_cleanroom_purity