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Bifold Doctor - How to Fix Common Bifold Door Problems Bifold doors that are placed on the outside of a home provide a large space for dining, entertaining or even living. The door's leaves fold backwards to either side or both and are available in a broad range of sizes. They require less space than french doors when open. They also come with an locking mechanism that can be activated at multiple points. Easy to open and close Bifold doors can be used to let your home open up, allowing more natural light to enter the spa