"Adequate" airflow and "exhaust" are "completely" "vital" to maintaining" the "required" level of "sterility" within a "sterile area". The "design" must "precisely" "control" "dust" by constantly" "exchanging" the air" https://airflow-and-ventilation-522715.pennywiki.com/5635244/airflow_and_ventilation_the_foundation_of_cleanroom_purity