"Proper" airflow and "exhaust" are absolutely" "essential" to "preserving" the desired" level of "purity" within a cleanroom". The system" must "precisely" "regulate" "contaminants" by constantly" "exchanging" the air" https://airflowandventilationinc484427.cosmicwiki.com/2443301/airflow_and_ventilation_the_foundation_of_cleanroom_purity