"Proper" airflow and ventilation" are "fundamentally" "vital" to "ensuring" the "required" level of "sterility" within a "controlled environment". The "design" must carefully" manage" "dust" by constantly" "exchanging" https://airflow-and-ventilation-670701.wikijournalist.com/442189/airflow_and_ventilation_the_foundation_of_cleanroom_purity