Not sure if we call this a door OR windows since really, you're making a whole wall an exquisite series of windows that retract and bring an exciting option to windows, doors, and walls!
The NanaWall® is a custom-made large opening glass wall system that is energy efficient, weather resistant and easily opens up to 12’ tall and almost unlimited width. Stringent independent testing insures that the NanaWall meets the most challenging architectural specifications. The NanaWall is NFRC rated and EnergyStar certified.