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Bifold Doctor - How to Fix Common Bifold Door Problems Bifold doors on the outside open an extension of the garden and create an airy space for living, dining or entertaining. The doors' leaves fold back to either side, or both and are available in a vast selection of sizes. As opposed to french doors, they take up very little room when open. They also have a locking mechanism that is activated at various points. Easy to open and close Bifold doors are ideal for opening up your home and allowing natural light to en