In recent years, with the improvement of people's living conditions and the continuous improvement of the requirements for air quality and quality of life, more and more families choose to install fresh air system in the decoration of new houses. The fresh air system is widely used in European and American countries. The fresh air system is based on the principle that the fresh air is sent indoors with special equipment on one side of the closed room, and then discharged outdoors from the other side by special equipment, which will form a "fresh air flow field" indoors, so as to meet the needs of indoor fresh air exchange. The implementation scheme is: the centrifugal fan is driven by high-voltage head, large flow and low-power DC high-speed brushless motor, the indoor air is supplied from one side by mechanical strength, and the new air flow field is forced to form in the system by the way that the specially designed exhaust fresh air fan is discharged outdoors from the other side. At the same time of air supply, fresh air is introduced into the indoor air for filtration, disinfection, sterilization, oxygenation and preheating (winter). When the exhaust air passes through the main engine, it carries out heat recovery and exchange with the fresh air, and most of the recovered energy is returned indoors through the fresh air. The scheme of forming a large-scale clean space is used to ensure that the air entering the room is clean. In order to achieve the purpose of indoor air purification environment. Next, Xianji network Xiaobian will introduce the function, air supply mode, advantages, installation method, installation details, causes and treatment methods of high noise, and purchase precautions of household fresh air system. Let's have a look!