A computing rack airflow directing system includes upper and lower rails configured for releasable attachment to a computing rack, and a flexible curtain suspended between the upper and lower rails at upper and lower edges of the curtain, respectively. The curtain is movable along the rails from a retracted position proximate a first end of the rails to provide access to one or more equipment modules mounted in the computing rack to an extended position to form a plenum for directing an airflow between the equipment modules and an airflow port. The airflow port is formed at either the upper edge or the lower edge of the curtain.