The two-way flow fresh air system is a central mechanical air supply and exhaust system based on the three principles of mechanical ventilation system, and it is an effective supplement to the one-way flow fresh air system. In the design of the two-way flow system, the positions of the exhaust air host and the indoor air outlet are basically the same as the unidirectional flow distribution. The difference is that the fresh air in the two-way flow system is supplied by the fresh air host. The fresh air main unit is connected to the indoor air distributor through a pipe, and the fresh air main unit continuously sends outdoor fresh air into the room through the pipe to meet people's daily needs of fresh and quality air. Both the exhaust vent and the fresh air vent are equipped with air volume control valves, and the indoor ventilation is realized through the power exhaust and delivery of the host.
The single fresh air system is a fresh air system product newly launched in recent years, which includes two products: wall-mounted fresh air system and floor-standing fresh air system. The main structure is not much different from the central fresh air system. The difference is that the single fresh air system does not require complicated piping works, and the installation method is very simple. It can be installed before and after decoration, and the maintenance cost in the later period is also very low.
