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This Environmental Product Declaration (EPD) is for business to business communication. This EPD refers to the single vent Concept System® 77 Window product family which meets elevated requirements regarding thermal insulation, stability and security. The insulation value (Uf) for the HI+ variant of this system goes down Declaration holder: Programme holder: Environmental Product Declaration – REYNAERS – Concept System® 77 windows 3 to 1.7 W/m²K for a standard opening window. The unique concept of the system makes it perfectly suitable for triple glazing. To match the different building types, the system is available in a variety of aesthetic styles: Functional, Renaissance and Hidden Vent. The CS 77 system includes the most complete range of solutions for all types of inward and outward opening windows. For the standard size 1.23m x 1.48m, calculations have been done for Double-glazed (D) and Triple-glazed (T) windows which are Operable (O) or Non-operable (N). For operable windows, calculations have been done with two different fittings: Siegenia (Si) or Sobinco (So). Hence, 6 representative products have been calculated for the standard size which corresponds to a surface area of 1.82 m2 . For the large sized windows, i.e. 1.48m x 2.18m, calculations have been done for double-glazed and tripleglazed windows which are operable or non-operable. Only the Sobinco fittings have been modelled for the large operable windows. Hence, 4 representative products have been calculated for the large window size which corresponds to a surface area of 3.23 m2 .