A fan includes, an impeller having propeller-shaped blades, a motor disposed inside of a hub to rotationally drive the impeller centered on the rotation axis, a tubular air duct forming an air passage on a periphery of the blades of the impeller and the rotation axis, wherein the rotation axis penetrates the inside of the air duct, and an exhaust outlet larger than an outer diameter of a rotation trajectory of the blades is formed on one end of the air duct, and an air flow guiding plate blocking an opening on an other end of the air duct in the rotation axis direction, a suction inlet through which the rotation axis passes being formed in approximately the center of the air flow guiding plate, wherein the blades are closer to the air flow guiding plate than the air duct.