The main function of jet fans is to enhance or weaken ventilation inside tunnels, as well as to control smoke in emergency situations.

    This special axial flow fan is usually installed at the top, side, or landing position of subway tunnels. When the jet fan is working, it will suck in a portion of the air inside the tunnel, accelerate through the impeller, and then shoot out at high speed from the other end. This high-speed airflow carries high kinetic energy and can transfer energy to other gases inside the tunnel, thereby generating a pressure rise that overcomes tunnel resistance and pushing air to flow in the direction of the airflow sprayed by the fan. This working mechanism achieves the intake of fresh air and the discharge of polluted air in the tunnel.

    In addition, jet fans also have the characteristics of small size, high efficiency, energy and electricity conservation, and fast air flow, which are suitable for the special needs of subway environments, such as moisture-proof and anti-corrosion.