https://articlescad.com/tips-f....or-explaining-bifold
How to Replace Bifold Doors Many home improvement stores sell bifold doors as kits that include doors, the track for installation and hardware. The door you purchase should have a total dimensions that are about one inch less than the width of the opening that is framed. 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 could be off-center or even missing. These problems are easily and inexpensively fixed. Cost B