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How to Replace Bifold Doors A lot of home improvement stores sell bifold doors as kits which include door panels as well as the installation track. The door you purchase should have a total width that is approximately one inch less than the size of the opening frame. If your bifold closet doors sag open it could be because of an unintentional top sliding track guide pin, or the bottom rotating floor pin may be a bit out of place or missing. These problems are easily and cheaply fixed.