"Adequate" airflow and "aeration" are absolutely" "essential" to "preserving" the "specified" level of "purity" within a "sterile area". The "configuration" must carefully" "regulate" "contaminants" by "continuously" https://cleanroom-ventilation-gu521290.wikibriefing.com/4380768/airflow_and_ventilation_the_foundation_of_cleanroom_purity