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Two-shell facade is a building system consisting of two shells placed in the outermost part of the building, which allows air flow in the middle cavity of these two shells. Cavity ventilation can be natural, using a fan or mechanical. Apart from the type of ventilation inside the cavity, the origin and destination of air circulation and the overall air conditioning strategy of the HVAC building can be determined depending on the type of weather conditions, type of use, local conditions of the project and operating hours of the building. The first shell can be any type of wall, but what is considered as the first shell of the facade in Iran is generally a glass facade, while this facade is in the form of single windows in the heart of the wall or the curtain wall glass facade. . In the construction of the second shell, light materials such as metals with minimum thicknesses should be used so that their strength and resilience against the pressures are not reduced, because finally the weight of the second shell is imposed on the structure of the building.