UPVC Folding Sliding Door

A folding door is a type of door which opens by folding back in sections or so-called panels. Folding doors are also known as 'bi-fold doors', in spite of them most often having more than two panels. Another term is 'concertina' doors, inspired by the musical instrument of the same name.Bifold doors fold back against themselves, concertina-style. Typically, between two and seven panels are connected by hinges and run along a concealed track on the floor or ceiling or both. Whereas sliding doors tend to be made of two or more large panes of glass which slide sideways to the end of a frame.