Fresh air ventilator is a kind of outdoor fresh gas after filtration, purification, heat exchange treatment into the room, at the same time the indoor polluted harmful gas after filtration, purification, heat exchange treatment out of the room, and the indoor temperature is basically not affected by the fresh air, an efficient energy-saving, environmentally friendly high-tech products. The core device of the fresh air ventilator is a full heat exchanger. The dirty air discharged from the room and the fresh air sent from the outside exchange temperature through the heat transfer plate and exchange humidity through the microholes on the plate, so as to achieve ventilation and maintain the indoor temperature and humidity stability. So that's total heat exchange. When the full heat exchanger runs in the summer cooling period, the fresh air obtains cold from the exhaust wind, reducing the temperature, and is dried by the exhaust air, reducing the humidity of the fresh air. When running in winter, the fresh air obtains heat from the exhaust wind, raising the temperature, and is humidified by the exhaust air.