What is the meaning of two-way ventilation promoted by Haier air conditioning? Is it Haier's patented technology?

It is a patent of Haier, which means that the dual fresh air device has two fans. One fan sends outdoor fresh air into the room, and the other fan discharges indoor dirty air to the outside. In the process of conveying fresh air and exhausting dirty air, the two kinds of air completely exchange heat and humidity through the total heat exchanger, and the heat and humidity are recovered to get fresh air and exhaust dirty air. During the whole exchange process, the two gases will not mix.