The present invention may be used for cooling generally enclosed spaces. An enclosure having an air flow duct intermediate two spaced apart cooled material compartments may have a first wall having apertures therein and a second wall having apertures therein separating the air flow duct from the two spaced apart cooled material compartments. The enclosure may have a top, a bottom, two side walls, an air port end wall having a port therein in fluid communication between the enclosure exterior and the air flow duct, and a fan end wall having a fan port therein in fluid communication between the enclosure exterior and the air flow duct. A fan may be attached to the fan end wall across the fan port. A cooled material may be disposed in the two spaced apart cooled material compartments and a power source may be connected to the fan.