Bifold
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Bifold doors, also known as folding or concertina doors, are folded in sections or panels, usually in two sections (although some with more sections are still called bi-folds). One of their other names is the concertina door because it resembles the instrument. Bifold doors are typically installed in areas with an opening too wide for any door to be practical. They can even be used in rooms where sliding doors can minimize space, but there is insufficient wall clearance for the door to slide into or behind when opened.
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