The HP ProCurve 6600 Series Air Plenum provides a 1U air plenum for 6600-24XG/6600-48G/6600-48G-4XG switches to optimize front-to-back airflow in a 4-port server or networking rack. The air plenum helps to maintain hot aisle/cold aisle pressure and temperature gradients to help improve cooling efficiencies while reducing cooling costs.