"Adequate" airflow and "exhaust" are "completely" "essential" to "ensuring" the "required" level of "purity" within a "sterile area". The "design" must carefully" "regulate" particles" by "continuously" "exchanging" https://the-role-of-airflow-in-c327929.wikiexcerpt.com/4587891/airflow_and_ventilation_the_foundation_of_cleanroom_purity