The system concerns in having a frame with hidden frame, that is behind the cover and coplanar to the door; all without the need for building masonry for installation. Without loosening the existing frame / false frame, it is possible to install the new window frame with several novelties: a satin-finish, satin-finish door cover that can be painted like a wall or finished with the frame; use of organic thermally treated materials; innovative opaque finishes; use on wood-wood, wood-aluminum, structural wood-glass windows, excellent air tightness, water and wind blows, high thermal and acoustic insulation values ??thanks to the type of glass; anti-intrusion level RC1 - RC2; different profiles: round, square and baroque.