The system of balcony lift and slide door with the thermal chamber MB-77HS is designated to create the architectural elements of exterior, which features the high thermal insulation, acoustic, water, and airproof. This system complies with all requirements for energy saving and environmental protection. Parameters of doors made of MB-77HS system elements meet easily the requirements of the strictest norms and laws. The features of MB-77HS system: relatively low heat transfer, coefficient of the frames U is meet thanks to wide thermal breaks, polyethylene and chamber plastic profiles assembled in thermal insulation strips. The technology of the construction is maximum simplified to make the door production quickest as possible.