The EcoAisle is an intelligent thermal containment solution designed to increase cooling system efficiency while protecting critical IT equipment and personnel. The Active Flow Controller (AFC) available in the EcoAisle provides the intelligence to communicate to the cooling system in order to right size the cooling airflow to match the load of the IT equipment providing a reduction in fan energy over conventional cooling systems. The Eco Aisle system adapts to varying rack heights, aisle widths and rack depths to support either hot or cold aisle containment.