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How to Replace Bifold Doors Many home improvement stores sell bifold doors in kits that include the door panels, track for installation and the hardware. The door you purchase should have a total width that is about an inch less than the width of the framed opening. If your bifold closet doors sag open it could be due to an unintentional top sliding track guide pin or the bottom floor pin rotating could be off-center or missing. These issues can be easily and inexpensively fixed. Cost Bifold doors offer modern and sleek design that can complet