US Patent 8427830 Cooling system

A system for cooling an environment housing a plurality of electronic equipment in one or more cabinets is disclosed, the system comprising a remote cooling unit(s) adapted to provide relatively cool air into the environment, an exhaust associated with each cabinet, the exhaust being provided with variable airflow means; the remote unit being adapted to receive exhausted air, and; sensor means adapted to determine cooling demand and alter the output of the remote cooling unit(s) accordingly. Schemes for using the system are described.