fresh air system is an independent air handling system consisting of air supply system and exhaust system, which can be divided into two types: ducted fresh air system and ductless fresh air system. The ducted fresh air system consists of a new fan and duct fittings. The outdoor air purified by the new fan is introduced into the room, and the indoor air is discharged through the duct. The ductless fresh air system consists of fresh air fans, which also purify outdoor air and introduce it into the room. Relatively speaking, the ducted fresh air system is more suitable for industrial or large-area office areas because of its large workload, while the ductless fresh air system is more suitable for home use because of its convenient installation. In 1935, after many attempts, Chun invented and manufactured the world's first heat exchange equipment that can filter air pollution, also known as fresh air system.
the fresh air system is based on sending fresh air indoors with special equipment on one side of a closed room, and then discharging it outdoors with special equipment on the other side, which will form a "fresh air flow field" indoors, thus meeting the needs of fresh air ventilation indoors. The implementation scheme is as follows: adopting a fan with high wind pressure and large flow rate, relying on mechanical strength to blow air indoors from one side, and exhausting it outdoors from the other side by using a specially designed exhaust fan to force the formation of a fresh air flow field in the system. Filter, disinfect, sterilize, aerate and preheat the air entering the room while blowing air (in winter).