The number of door panels used depends on the width of each one individually, but it is best to go for as few as possible. The maximum width of each door panel is around 36” to 38” and the minimum width of each panel is 26” for folding sliding doors.
Top hung systems: As the name suggests these are hung from a track above. They require a steel lintel to take the weight of the doors. With no track at the bottom, these offer a level threshold that won’t trap dirt or debris.