The function of fresh air

Fresh air system refers to the use of dedicated equipment to filter outdoor fresh air and send it indoors. At the same time, dedicated equipment is used to exhaust indoor dirty air to the outside, achieving system balance while also replacing the air in the room, enabling scientific air convection in a closed space, which is equivalent to adding a breathing system to the room. Fresh air system is divided into one-way and two-way systems, "Unidirectional flow cannot be mechanically ventilated or exhaustively ventilated at the same time. Both two-way flow ventilation and exhaustively ventilated can be accomplished by machines, with higher efficiency, but also relatively expensive prices.".