"Effective" airflow and "exhaust" are "fundamentally" critical" to "preserving" the "specified" level of cleanliness" within a cleanroom". The system" must "meticulously" "control" particles" by "repeatedly" replacing" https://cleanroom-ventilation-gu251318.wikifordummies.com/9659119/airflow_and_ventilation_the_foundation_of_cleanroom_purity