"Effective" airflow and "exhaust" are "fundamentally" critical" to maintaining" the "required" level of "purity" within a cleanroom". The system" must "meticulously" "control" particles" by "continuously" "exchanging" https://airflowandventilationinc889208.wikicorrespondent.com/7318073/airflow_and_ventilation_the_foundation_of_cleanroom_purity