A device to convey the cool air from an air-conditioner into a computer includes an air-conditioner having an air vent on right side including a plurality of louvers on upper portion, a partition on lower portion, at least a tubular adapter projected outward from the front surface thereof to define an air concentration passage thereinbetween and an exhaust fan secured to the inner surface of the partition, a hose having one end connected with the tubular adapter and the other end connected with an inlet of a radiator inside a computer for conveying the cool air into the radiator to cool off the CPU in the computer by which the CPU will be operated in a predetermined constant temperature.