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How to Replace Bifold Doors Many home improvement stores offer bifold doors as kits, that include door panels and installation track. The kit should be about an inch smaller than the framed opening. If your bifold closet doors are slipping open it could be because of an unintentional top sliding track guide pin, or the floor pin that rotates at the bottom might be out of place or even missing. These issues can be easily and cheaply fixed. Cost Bifold doors provide modern and sleek design