The chassis supports one hot-swappable fan tray. One fan tray model is available – WS-X4593-E The fan tray contains six individual fans. The individual fans are not field replaceable; you must replace the fan tray in the event of a fan failure. Air is drawn in on the right side of the chassis and exhausted on the left side of the chassis. Fan tray STATUS LED (located on the fan tray front panel) – Red—One or more individual fans have failed. – Green—Fan tray is operating normally.