The reason why the super-large energy-saving fan can cover such a large area depends on the unique streamlined fan blade design, which can reduce the resistance to the minimum and convert the highest efficiency of electric energy into the kinetic energy of air. In addition, the airflow structure of the fan is different from that of the ordinary small fan. The small fan can only cover the range of the fan diameter, while the super-large energy-saving fan first pushes the airflow vertically to the ground, and then forms a 1-3 meter high airflow layer on the ground, thus forming a super-large coverage area not limited to the lower part of the super-large energy-saving fan. In an open space, a fan can cover even a very large area of 1400_.