TP1000K is a system that can be installed on wide window frames, even up to 202 mm (with broadening to 264 mm). Using an expanding element we increase the depth of the box by 31 mm or 62 mm. This system has the capability of creating a revision cover from the bottom (with a build-up box from the inside), or the front (during the installation on a wide window frame). The possible service is both manual – with the use of a belt – and electric – with the use of a switch or a remote control. It has two-chamber load carrying walls that provide better thermal insulation and their high stiffness makes it impossible to bend the box during the installation.