"Adequate" airflow and "aeration" are absolutely" "essential" to "preserving" the "specified" level of cleanliness" within a "controlled environment". The "design" must "precisely" "control" particles" by "repeatedly" https://why-cleanroom-ventilatio518532.goabroadblog.com/40584359/airflow-and-ventilation-the-foundation-of-cleanroom-purity