HST sliding doors are the only window structures that allow the creation of large-scale glazing, providing an exceptional view of the space around the house. The width of the sash can range from 800 mm to 3,000 mm wide and the height up to 2,700 mm in white, allowing you to create even more than six meters of glazing. HST doors are a modern and safe solution, designed to eliminate ubiquitous barriers. Low threshold door, which can be recessed from the side of the room in its entire height, meets the requirements for barrier-free construction Architectural barriers and allows trouble-free entry and exit. With this solution, it is also possible to level the threshold with the floor surface and thus completely eliminate architectural barriers. Special hardware mechanisms allow huge sashes to be moved with minimal force. Turning the large handle downward from the closed position raises the sash by a few millimeters, releasing the pressure of the seals and allowing the sashes to move freely, which slide against each other or against the unopened parts of the structure without the slightest resistance. HST doors are an excellent alternative in terms of space arrangement in relation to classic balcony doors, which enter deeply into the living space after opening the wings. Despite the greater installation depth than classic balcony doors, it is the HST doors that leave more freedom in the disposition of space.