A heat exchange unit suitable for combination with a propeller fan comprises at least one pipe for coolant having porous passages for coolant inside thereof, said pipe being either spirally wound or one of a plurality of substantially circular pipes which are coaxially arranged. An inlet header are and an outlet header respectively connected to the inlet or the outlet of the pipe for coolant. At least one corrugated fin is interposed in a space formed between the adjacent pipes or portions of the spirally wound pipe. The heat exchanger is provided with a space at the central portion, and a fan motor is positioned in the central space of the heat exchanger. A propeller fan is fitted to the rotary shaft of the fan motor to feed air to the heat exchanger.