The double-layer curtain wall has evolved into four forms, representing its four evolutionary processes. They are monolithic, corridor-style, channel-style and box-style double-layer curtain walls. The latter is currently a relatively new technology, which is Breathing curtain wall with independent ventilation function. Nowadays, the breathing glass curtain wall has become a technologically avant-garde, ecological and energy-saving curtain wall system in Europe. Heat preservation, heat insulation, energy saving, noise reduction, dust prevention, the mezzanine can be used as a channel for exhaust gas discharged from the building to ensure fresh indoor air.

　　Breathing glass curtain wall system has the following functions and advantages:

　　1. The glass outer surface of the double-layer curtain wall can withstand the influence of climate, so that the temperature difference between the room temperature and the inner surface of the glass is minimized, and the area along the periphery of the facade becomes comfortable and pleasant.

　　2. The building is equipped with centralized outer curtain wall shutters, and the inner curtain wall can effectively protect the outer curtain wall shutters from man-made damage;

　　3. The thermal performance of the internal breathing glass curtain wall is also much better than that of the ordinary glass curtain wall. This kind of curtain wall construction treatment can save a lot of energy; in addition, through the active use of light energy, the air in the middle of the double-layer curtain wall can be reduced after heating. Loss of heat during transmission and room ventilation.

　　4. The double-glazed glass and the air cavity in the middle effectively block outdoor noise, have good sound insulation performance, greatly reduce noise, and act as a barrier between the building and the road.

　　5. The internal breathing glass curtain wall can circulate the office air naturally, thereby reducing the use of air conditioning systems, improving human discomfort, and avoiding problems such as "Sick Building Syndrome" and "Aquarium Effect".

　　6. ??The most direct effect of adopting internal breathing glass curtain wall is energy saving. Compared with single-layer curtain wall heating, it can save energy by 30%-40% and cooling energy.