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How to Replace Bifold Doors Many home improvement stores sell bifold doors in kits, which include door panels as well as the installation track. The kits you purchase should have a total dimensions that are about an inch smaller than the size of the framed opening. If your bifold closet doors sag open It could be because of an unintentional top guide pin for the sliding track or the floor pin that rotates at the bottom may be a bit out of place o