"Adequate" airflow and "exhaust" are "completely" "essential" to "preserving" the desired" level of "purity" within a "sterile area". The "design" must carefully" "regulate" "contaminants" by "continuously" replacing" https://why-cleanroom-ventilatio886697.wikififfi.com/2471053/airflow_and_ventilation_the_foundation_of_cleanroom_purity