YTHL mixed flow fanThe pressure coefficient and flow coefficient, as well as the linear connection method, are suitable for pressurization, supply and exhaust of air duct systems in various civil and industrial buildings, as well as general ventilation and air exchange. In other high-rise buildings that require the installation of fire smoke exhaust systems, the positive pressure air supply fan used as a smoke proof staircase and front room can maintain the necessary positive pressure in the staircase and front room during a fire, ensuring the safe evacuation of personnel.