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This Environmental Product Declaration (EPD) is for business to business communication. This EPD refers to the M7 curtain wall which is a façade system that offers unlimited design freedom and allows maximum transparency. M7 is available in several design and glazing variants. The representative product is a doubleglazed curtain wall of 6 m high by 3,6 m wide as sketched in Figure 1.The representative products are composed of 2 vertical mullions (profiles) and 2 horizontal transoms forming the border of the section. 2 additional vertical mullions and 4 transoms divide the curtain wall area in 15 squared sections of identical size, i.e. 1,2 m wide. All these sections are filled with double glazing units. As a conservative estimate, the calculated BoM considers 100% of the mass of the profiles located at the boarder of the representative product. In practice, these profiles can be shared with subsequent curtain wall sections Figure 2 illustrate the cross section of a typical transom and mullion from which the Bill of Materials has been calculated. Table 1 summarise the main characteristics of the representative product.