L & R WINDOORS Balcony Doors are intended to provide more glass area due to an overall. slimmer frame sight line and are available as either single or double doors (French doors). opening-in or opening-out. and are offered with one operating handle by design. which is positioned inside. A special handle and a concealed snap-in device enables a temporary closing of the door when outside. Balcony doors can be stand-alone items. manufactured with fanlights and/or sidelights. or integrated into complete curtain walling screens.