Nowadays, as air-conditioner is being used widely, most air in the air-conditioner using places is polluted, which will harm people’s health directly. In order to clean the air in the closed buildings and save energy, our company produced the new and high efficiency Energy Recovery Ventilator (ERV) that satisfies people’s need for high quality air in the working and living places, and has high energy recovery efficiency. Because of its main features of providing fresh air and saving energy, using the ERV can recover the lost energy efficiently while the ERV is exchanging the indoor air with outdoor air. That can save the maximum energy. That the ERV inputs and outputs the air at the same time can ensure a comfortable environment inside the house. ERV together with air-conditioning can increase the freshness of the indoor air, maintain its warmth and humidity criteria, reduce the fresh air load and lower the bulk and daily operating cost to reach the two goals of cleaning the air and saving energy. The products can be used in almost all the places needing fresh air, such as offices, meeting rooms, exhibition halls, theatres, hotels, hospitals, residences, apartments, factories and mines and so on.