The Cisco Nexus 2200 chassis provide a choice of standard airflow and reversed airflow to enable optimization for top-of-rack (ToR) or network rack deployments.
Standard-airflow fan
This option provides front-to-back airflow, with ports aligned with the hot aisle. It is ideal for ToR deployments to align the fabric extender ports with the server ports in a given rack.
Reversed-airflow fan
This option provides back-to-front airflow, with ports aligned with the cold aisle. It is ideal for network rack deployments in which various network equipment ports need to be aligned.