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How to Replace Bifold Doors Many home improvement stores sell bifold doors as kits that include the door panels, installation track, and hardware. The doors should be about 1 inch smaller than the frame opening. If your bifold closet doors sag open, it could be because of an unintentional top guide pin for the sliding track or the bottom floor pin rotating could be off-center or even missing. These problems can be fixed easily and inexpensively. Cost Bifold doors can transform a home with their