Ventilation system is a set of independent air treatment systems consisting of a supply air system and an exhaust air system. It is divided into two types of ducted fresh air system and ductless fresh air system. The ducted fresh air system consists of fresh air fans and pipe fittings. The fresh air is used to purify outdoor air into the room, and the indoor air is exhausted through the pipes. The ductless fresh air system consists of fresh air, which is also used to purify outdoor air into the room.
