The FAN-1 is a 1RU rack mount compact fan system. The Fan-1 is meant to replace vented 1RU blank spacers to increase cooling for those really hot pieces of electronic equipment. It uses 3 mini (40 x 40 mm) DC powered ball bearing fans. The three fans are rated at 15 cubic feet per minute (cfm) or 5 cfm each. It will replace the air in a 30 inch (750mm) deep rack up to 25 times per minute. Front panel on/off switch. The unit comes with a 120v AC to 12v 1.25 amp dc convertor. The DC socket is a standard 2.1 x 5.5 mm center positive.