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They look like non-opening sashes, yet retain the full functionality of classic windows.

Windows with invisible / concealed sashes are solutions found in all designs aiming to combine the best technical parameters available for windows, minimalist design, and maximum glazing area in tilt-and-turn constructions. Such products have fully functional, specially shaped sashes that completely &lsquo;hide&rsquo; behind the frame, making them indistinguishable from non-opening windows from the outside. Windows with concealed sashes have all the functionalities of classic constructions and can be made in countless configurations including enhanced burglar protection, high sound insulation, glazing that limits overheating, etc.

minimalist design
can be integrated into the fa&ccedil;ade
glazing up to 25% larger
very good thermal performance&nbsp;
very high air-tightness
wide glass range available
invisible hinges
all the advantages of a classic window

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Invisible sash windows are products for those who do not compromise. They blend in well with modern and minimalist architecture, which brings large glazings with built-in frames to the fore. They match the design of thin-frame sliding windows, combine with sun screens and all-glass barriers, have a wide range of configuration options, and are exactly as functional as classic designs.
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Tilt-and-turn windows with invisible sash allow single and multi-sash constructions, including the use of a movable mullion system, with heights of up to 300cm. By default, they are equipped with triple glazing units with a heat transfer coefficient of Ug=0.5 W/m2K, it is also possible to use toughened glass, safety glass, burglar-proof glass, glass with increased acoustic insulation, as well as glass with coatings limiting the heating of rooms, self-cleaning coating, reflective coating, and many others. As standard, they have hardware with concealed hinges and dedicated handles of modern design, and can also be fitted with opening sensors (reed switches) and a range of functional extras. Concealed sash windows are combined with other non-opening, sliding, and facade window systems and come in any colour according to the RAL palette.