Air outlet system for air conditioning

The air outlet system comprises a ventilation pipeline, an exhaust hood located in a pathology department and an outdoor fan set, one end of the ventilation pipeline is connected with the exhaust hood, and the other end of the ventilation pipeline is led to the outside; the device further comprises an air heater, a plasma purification device, a heat exchange assembly and a filtering device. The air heater is arranged on the ventilation pipeline; the end, leading to the outdoor, of the ventilation pipeline sequentially communicates with the plasma purification device, the heat exchange assembly and the filtering device. The filtering device is connected with the fan set through a pipeline. An air heater is arranged on the ventilation pipeline; air extracted from the pathology department and mixed with formaldehyde, xylene and other harmful gases is heated through the air heater, the adhesion of the formaldehyde, xylene and other harmful gases is reduced, the adhesion of the formaldehyde, xylene and other harmf