1. One-way fresh air system

The one-way fresh air system is a diversified ventilation system formed by combining central mechanical exhaust and natural air intake based on the three principles of mechanical ventilation system. It is composed of fans, air inlets, exhaust outlets and various pipes and joints. The fan installed in the ceiling is connected to a series of exhaust outlets through pipes. When the fan is started, the turbid air in the room is discharged to the outside through the air inlet installed in the room, forming several effective negative pressure areas in the room. The indoor air continuously flows to the negative pressure area and is discharged to the outside. The outdoor fresh air is continuously supplemented to the room by the air inlet installed above the window frame (between the window frame and the wall), so that high-quality fresh air can be breathed all the time. The air supply system of this fresh air system does not require the connection of the air supply duct, and the exhaust duct is generally installed in places where there are usually ceilings, such as corridors and toilets, and basically does not occupy additional space.

2. Two-way fresh air system

The two-way fresh air system is a central mechanical air supply and exhaust system based on the three principles of mechanical ventilation system, and is an effective supplement to the one-way fresh air system. In the design of the two-way flow system, the positions of the exhaust main unit and the indoor exhaust outlet are basically the same as those of the one-way flow distribution. The difference is that the fresh air in the two-way flow system is delivered by the fresh air main unit. The fresh air main unit is connected to the indoor air distributor through a pipeline. The fresh air main unit continuously delivers outdoor fresh air into the room through the pipeline to meet people's daily needs for fresh and high-quality air. The exhaust outlet and the fresh air outlet are both equipped with air volume regulating valves, and indoor ventilation is achieved through the power exhaust and delivery of the main unit.