Classic is the basic system of Sky-Frame. The sliding doors consist of insulating glass units with perimeter sections made of aluminum or fiberglass-reinforced plastic (GRP). Mounted on aluminum frames that are flush with the floor and ceiling, the sliding units offer minimal rolling resistance when operated. The system of straight-line doors evokes a timeless appeal. True to the Bauhaus vision, the tall glass facades help create minimalist architecture where the view takes center stage.