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How to Replace Bifold Doors Many home improvement stores sell bifold doors as kits that include door panels, installation track and the hardware. The doors should be about one inch smaller than the frame opening. If your bifold doors are squeaking open, you may have an unreliable guide pin on the top of the sliding track or the floor pin at the bottom is not in place or is not there. These problems are easily and inexpensively fixed. Cost Bifold doors can transfor