Upvc 3 Panel Sliding Balcony Doors are made up of sashes that slide horizontally, to the left or right. These doors can be made wider & taller with the addition of sashes. These sliders can work on a 'ride over' mechanism and make most of the space, by offering unhindered access as doors do not encroach upon the room when open. Moving easily and quietly, Upvc 3 Panel Sliding Balcony Doors close smoothly with Silent System. Their Multi-chamber system enhance heat and sound insulation.