It is one of the intrinsic building envelope function which can be defined as the resistance of inward or outward air leakage through unintentional openings in the envelope. Airtight envelope has several pros in thermal efficiency and comfort which affect substantially in energy savings and HVAC equipment capacities as well. The mold because of moisture could be reduced especially in coastal regions if the façade achieves airtightness standard. The airtightness of buildings would be affected by wind load which is determined based on the location and direction of the building, its height, and purpose of use. In the case of clustered high-rise buildings, the wind tunnel effect must be considered to avoid a negative impact on air leakage and structural failure and stability too. To achieve the specific level of airtightness that has been determined by the façade designer, a tested and certified aluminium CW/window system which matches the specific one should be chosen. A performance mockup test is also strongly required to check the integrity of all components together before construction where performance mockup unit, including all components with proper terminations, could be performed at the attested laboratory in order to ensure achieving the specific air permeability level.Maximize building performance and energy efficiency with CW window and facade design guidelines, ensuring innovative design solutions for modern buildings.
https://wfmmedia.com/cw-window-facade-design-criteria-guideline/
