External rotor axial fan with a large amount of wind, small vibration, low noise, reliable operation, suitable for low wind resistance of the occasion. Efficient axial fans with square panels for restaurants, gymnasiums, meeting rooms, workshops, warehouses, swimming pool and greenhouse ventilation. External rotor axial fan duct tape applied to air conditioning systems, refrigeration systems and dehumidification drying system. "Mini Air Cooling Fan" can also be used for ventilation and cooling other usual conditions.