A Bifold-door is defined: Doors that are hinged in the middle for opening into a smaller area than standard swing doors. These doors are designed to be used in closets, pantries, and in some cases as folding doors between rooms. A door unit configuration hanging from a track mounted in the top of the door jamb (frame), always done in pairs with two doors folding to one side of a door opening or, four doors, two folding back to one side and two doors folding back to the other side.For multiple doors ( such as 6,8,10,12 panels) would be called multi folding doors. This uses much the same hardware as bi-fold doors only in a different configuration.

If you need some hardware for bifold doors, click here.