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A hinged hidden double sash 122 mm system that allows for quadruple glazing facilitating a total accoustic silence and an optimum thermal insulation. There is the possibility of incorporating a manual or motorized venetian blind or shutter in the internal (65 mm) chamber. Also Access to the chamber is possible for cleaning and maintenance. Additionally there is a quadruple gasket system that improves the thermal and accoustic insulation.

The Passivhaus Certified Window by KÖMMERLING is engineered for superior energy efficiency, making it an ideal choice for sustainable building projects. Certified by the Passivhaus Institute for Temperate Climates, this window is suitable for Passive House and Nearly Zero Energy Buildings (NZEB) across the Iberian Peninsula. It features a neopor-filled frame that enhances thermal insulation while maintaining high inertia with galvanized steel reinforcements in the sash. This ensures the window's suitability for large-scale glazing applications without compromising on performance. Designed to meet the rigorous standards of energy-efficient construction, the Passivhaus Certified Window offers a thermal transmittance of Uw=0.99 W/m2K. Its robust construction and innovative design make it a reliable choice for reducing energy consumption and enhancing indoor comfort. The window's compatibility with large dimensions and its ability to maintain structural integrity under various environmental conditions make it a versatile solution for modern architectural needs.