The JK series (JK58, JK55, JK56, BJK67, JK40, DJK50) mining local fans (referred to as local fans) are designed according to the local ventilation needs of non mining enterprises such as metallurgy, non-ferrous metals, gold, chemical, building materials, and nuclear industries. The design fully considers the required air volume of various local ventilation working faces, the air supply distance of the air duct, commonly used air duct specifications, air resistance values, and the usage conditions inside the mine. Therefore, they are more suitable for ventilation of various specifications of cross sections in tunnel excavation, electric rake induced draft in mining sites, segmented mining method with no bottom pillars, and other local ventilation as well as certain auxiliary ventilation. When conditions permit, they can also be used for tunnel construction, underground engineering, and other projects that require air supply. In situations where air is supplied through a cylinder. The JK40 series local fan and DJK50 series counter rotating local fan can be directly installed on the bottom plate of the tunnel, or suspended and installed on the wall or roof of the tunnel. The JK series fan is divided into three categories: 1. Single stage working wheel JK-1No 2. Double stage working wheel JK-2No 3. Counter rotating operation