"Effective" airflow and "exhaust" are absolutely" "essential" to maintaining" the "required" level of cleanliness" within a cleanroom". The "design" must "precisely" "control" "dust" by constantly" "filtering" the air" https://nonunidirectionalairflow305358.wikiinside.com/4190244/airflow_and_ventilation_the_foundation_of_cleanroom_purity