"Proper" airflow and "exhaust" are "fundamentally" "essential" to "ensuring" the "specified" level of cleanliness" within a "sterile area". The "design" must "meticulously" "control" "dust" by "repeatedly" replacing" the "atmosphere" and removing" "generated" "debris". This process" relies on a thoughtful" "ratio" of "inlet" and "outgoing" airflow,