1. A data center comprising:an enclosure including:
a plurality of side walls;
a floor on which a plurality of rows of server racks are arranged to form a space between the rows of the server racks;
a plurality of dampers for directing a flow of air from outside the enclosure into the enclosure,
wherein the server racks are configured to receive a plurality of servers, wherein one of the server racks has a side that is physically interconnected to a plurality of tubes for allowing passage of air from the space between the rows of the server racks to outside the space between the rows of the server racks, wherein the plurality of tubes are coupled to a face of a fan unit having multiple fans, wherein the plurality of tubes include a first tube and a second tube, wherein the first tube extends from a first location on the one of the server racks to a first location on the fan unit and the second tube extends from a second location on the one of the server racks to a second location on the fan unit,
wherein one of the rows of server racks and one of the side walls are arranged to form a space therebetween; and
a mixing chamber located between the ceiling and the rows of the server racks to mix the air received from outside the enclosure with hot air received from the plurality of servers.