"Proper" airflow and "exhaust" are "completely" "essential" to maintaining" the "required" level of "purity" within a "controlled environment". The "design" must "precisely" "regulate" "contaminants" by "continuously" https://the-role-of-airflow-in-c672966.wikipublicist.com/6287724/airflow_and_ventilation_the_foundation_of_cleanroom_purity