"Proper" airflow and ventilation" are "completely" "essential" to "preserving" the desired" level of "purity" within a cleanroom". The "configuration" must carefully" "control" particles" by constantly" "exchanging" https://nonunidirectionalairflow791905.eqnextwiki.com/5880581/airflow_and_ventilation_the_foundation_of_cleanroom_purity