"Effective" airflow and "exhaust" are "fundamentally" "essential" to "preserving" the desired" level of "purity" within a "controlled environment". The system" must carefully" "control" "contaminants" by constantly" https://unidirectional-airflow-c813480.wikiconversation.com/8202428/airflow_and_ventilation_the_foundation_of_cleanroom_purity