In the city life, outdoor air dust, pollen, Piaoxu, noise, indoor moisture, odor, smoke also let people aspire to the high quality of life more and more intolerable, the more repair the wide road, the vehicle more and more, and the ventilation window for fresh air The stream never stops flowing., gas need to pay a higher price. These are physical pollution. United States, "preventive medicine" magazine reported that the exposure to pollutants in the home is much more than outside, from heavy metals to a variety of volatile organic chemicals are. According to the United States Environmental Protection Agency conducted a related study shows that the average person in the home exposure to the risk of carcinogenic factor has a record high, 5 times higher than in the outdoors when the times of 70 times. A children's Hospital in Beijing, in the admissions of children with leukemia, conducted a survey on the living environment of the family, found that most patients at home close within half a year had room decoration, but mostly luxury decoration. Recently, the Beijing Municipal Health Bureau on some residential areas and office sampling shows that the newly renovated room formaldehyde content generally exceeded, the highest actually exceeded 73 times! Thousands of years of human nature to create fresh air is difficult to copy. The quality of life is not only the need of the standards of air pollution, but the need for fresh, clean, quiet and comfortable air, as people love mountain sea nature air. Now, breathe fresh air, quiet in the indoor work study and life, more and more urban people become unattainable luxury. Ventilation energy saving dilemma now has an effective and feasible solution. "In order to avoid air pollution, solve the problem of indoor air pollution and create a clean and clean indoor environment for the residents to breathe, spawned a high-tech enterprise specialized in the improvement of indoor air environment, fresh air system also will be listed." Industry Research Institute academician Zhang Yanping said, "currently on the market of fresh air system, which belongs to the third generation products, to create intelligent new era, intelligent control, full automatic operation, for indoor pollution, automatic switch machine, a type of intelligent operation, deal with the problem of pollution in the room. Humanized design, 360 degree omni-directional installation, ensure the indoor ventilation and no dead corner, full of removal of indoor pollution, solve the problem of ventilation door windows, reduce or eliminate due to poor ventilation caused by indoor walls, furniture, clothes moldy phenomenon, at the same time, effectively prevent outdoor noise pollution caused by preventing window ventilation theft resistant ancient central air system, to achieve 24 hours of uninterrupted ventilation, maintain indoor air is always in oxygen enriched, clean and healthy state, the human body needs continuous supply of fresh air, increase blood content, avoid hypoxia leads to fatigue, weakness, memory loss and other threats. Continuous ventilation, effective removal of toxic and harmful substances in indoor excessive carbon dioxide, sulfur dioxide and ammonia, TVOC, dust and so on, to avoid sick building syndrome dizziness, chest tightness, shortness of breath, fatigue, memory loss and other symptoms.