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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 penet

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.

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1. A fan comprising: an impeller having a plurality of propeller-shaped blades;a motor configured to rotate the impeller;an air duct having a first end, a second end, and an exhaust outlet, the exhaust outlet being larger than an outer diameter of a rotation trajectory of the blades of the impeller

1. A fan comprising: an impeller having a plurality of propeller-shaped blades;a motor configured to rotate the impeller;an air duct having a first end, a second end, and an exhaust outlet, the exhaust outlet being larger than an outer diameter of a rotation trajectory of the blades of the impeller on the first end;an air flow guiding plate partially blocking an opening on the second end of the air duct;a motor-base configured to support the motor; anda plurality of connecting strips configured to connect and fix the motor-base to the air flow guiding plate,wherein the motor-base and the connecting strips are disposed on a suction inlet side of the fan, andwherein a portion of the connecting strips and the motor-base are disposed away from the blades compared with the air flow guiding plate. 2. The fan according to claim 1, wherein the air duct comprises a first region located adjacent an outer edge of the blades, anda second region located away from the outer edge of the blades compared to the first region. 3. A fan comprising: an impeller having a plurality of propeller-shaped blades;a motor configured to rotate the impeller;an air duct having a first end, a second end, and an exhaust outlet, the exhaust outlet being larger than an outer diameter of a rotation trajectory of the blades of the impeller on the first end; andan air flow guiding plate partially blocking an opening on the second end of the air duct,wherein the blades are closer to the air flow guiding plate than the air duct,the air flow guiding plate has an inclined inner edge portion which inclines to approach a rotation axis of the impeller as the air flow guiding plate separates from an exhaust side of the blades in a rotation axis direction of the impeller,a chamfered portion which inclines corresponding to an inclination of the inclined inner edge portion is disposed on the blades in a position facing an inner surface of the inclined inner edge portion, andthe air flow guiding plate and the blades are disposed such that a gap between the air flow guiding plate and the blades is smallest between the inclined inner edge portion and the chamfered portion. 4. A fan comprising: an impeller having a plurality of propeller-shaped blades;a motor configured to rotate the impeller;an air duct having a first end, a second end, and an exhaust outlet, the exhaust outlet being larger than an outer diameter of a rotation trajectory of the blades of the impeller on the first end; andan air flow guiding plate partially blocking an opening on the second end of the air duct, whereinthe blades are closer to the air flow guiding plate than the air duct,the impeller has a substantially cylindrical hub, the blades being attached on a side surface of the hub, anda portion of the impeller on an exhaust outlet side further comprises a disc attached centered on a rotation axis of the impeller, a diameter of the disc being larger than an outer diameter of the hub and smaller than an outermost diameter of the rotation trajectory of the blades. 5. An electronic device, comprising the fan according to claim 4 disposed and built in an outer wall, wherein an exhaust hole is formed on the outer wall in a region facing the exhaust outlet of the fan. 6. An electronic device comprising: a first wall which is an outer wall of the electronic device;a second wall facing the first wall;a fan disposed inside the first wall and having an exhaust portion, the exhaust portion of the fan being disposed adjacent the first wall, and a suction portion of the fan being disposed adjacent the second wall; anda circuit board arranged so as to be cooled by the fan, and being disposed laterally to a clearance between the second wall and the suction portion of the fan,wherein the fan comprisesan impeller having a plurality of propeller-shaped blades,a motor configured to rotate the impeller,an air duct having a first end, a second end, and an exhaust outlet, the exhaust outlet being larger than an outer diameter of a rotation trajectory of the blades of the impeller on the first end,an air flow guiding plate partially blocking an opening on the second end of the air duct,a motor-base configured to support the motor, anda plurality of connecting strips configured to connect and fix the motor-base to the air flow guiding plate, and whereinthe motor-base and the connecting strips are disposed on a suction inlet side of the fan. 7. The electronic device according to claim 6, wherein the impeller has a substantially cylindrical hub, the blades being attached on a side surface of the hub, andan inner diameter of the suction inlet disposed on the air flow guiding plate is smaller than an outer diameter of a rotation trajectory of the blades and larger than an intermediate diameter of the outer diameter of the rotation trajectory of the blades and an outer diameter of the hub. 8. The electronic device according to claim 6, wherein the impeller has a substantially cylindrical hub, the blades attaching on a side surface of the hub, andan exhaust hole is disposed on the first wall in a region on an outside of a regulation circle which has a diameter that is larger than an outer diameter of the hub and smaller than the exhaust outlet, centered on a position corresponding to a rotation axis of the impeller. 9. The electronic device according to claim 6, wherein an exhaust hole is disposed on the first wall in a region facing the exhaust outlet of the fan. 10. An electronic device comprising: a first wall which is an outer wall of the electronic device;a second wall facing the first wall;a fan disposed inside the first wall and having an exhaust portion, the exhaust portion of the fan being disposed adjacent the first wall, and a suction portion of the fan being disposed adjacent the second wall; anda circuit board arranged so as to be cooled by the fan, and being disposed lateral to a clearance between the second wall and the suction portion of the fan,the fan comprisingan impeller having a plurality of propeller-shaped blades,a motor configured to rotate the impeller,an air duct having a first end, a second end, and an exhaust outlet, the exhaust outlet being larger than an outer diameter of a rotation trajectory of the blades of the impeller on the first end, andan air flow guiding plate partially blocking an opening disposed on the second end of the air duct, the air flow guiding plate having an inclined inner edge portion which inclines to approach a rotation axis of the impeller as the air flow guiding plate separates from an exhaust side of the blades in a rotation axis direction of the impeller, whereinthe fan is configured to inhale heat from the circuit board via an outer side of the inclined air flow guiding plate. 11. An electronic device comprising: a first wall which is an outer wall of the electronic device;a second wall facing the first wall;a fan disposed inside the first wall, and having an exhaust portion, the exhaust portion of the fan being disposed adjacent the first wall, and a suction portion of the fan being disposed adjacent the second wall; anda circuit board arranged so as to be cooled by the fan, and being disposed lateral to a clearance between the second wall and the suction portion of the fan,the fan comprisingan impeller having a plurality of propeller-shaped blades,a motor configured to rotate the impeller,an air duct having a first end, a second end, and an exhaust outlet, the exhaust outlet being larger than an outer diameter of a rotation trajectory of the blades of the impeller on the first end, andan air flow guiding plate partially blocking an opening on the second end of the air duct, whereinthe fan is configured to inhale heat from the circuit board via an outer side of the inclined air flow guiding plate. 12. A fan comprising: an impeller having a plurality of propeller-shaped blades,a motor configured to rotate the impeller,an air duct having a first end, a second end, and an exhaust outlet, the exhaust outlet being larger than an outer diameter of a rotation trajectory of the blades of the impeller on the first end, the air duct having an inclined inner edge portion which inclines to approach a rotation axis of the impeller as the air duct separates from an exhaust side of the fan, andan air flow guiding plate partially blocking an opening on the second end of the air duct, whereinthe fan is configured to guide air in an outer surface side of the air duct to a suction portion of the fan via an outer surface of the air flow guiding plate.