Fresh air system is an independent air purification system consist of air supply system and air exhaust system, there are two types of fresh air system: duct and ductless fresh air system. Duct fresh air system includes the fresh air fan and duct auxiliaries, the fresh air is inducted indoor by fresh air fan from outdoor after purification, and the air indoor is exhuasted through duct; Ductless fresh air system consists of the fresh air fan, in the same way, the outdoor air is inducted indoor via the fresh air fan. Generally speaking, the duct fresh air system is prefered in industrial or large office area, while ductless fresh air system are more suitable for home for its easy installation. This is a supply of fresh air by specialized equipment from one side of the closed indoor, and the exhaust of air to outdoor from the other side, this will create a “Fresh air flowing field” indoor. Thus the requirements of fresh air ventilation indoor is satisfied.

The implementation plan: high air pressure and high flow rate fan is used to supply air indoor by mechanical force from one side, specially designed exhaust fan is used to exahust air outdoor from the other side, a fresh air flowing field is generated within the system. The indoor air could be filtrated, disinfected, sterilized, oxygenated and preheated(in winter) during the air supply.