Quad Dual-Fold Notes:
The two center stiles will be trimmed about 1/4" in width to assure the edge of the doors clears the wide throw hinge knuckle.
Stile and rail doors 24" and wider typically have a 4" stile (not including the sticking). The center stile will be about 3-3/4" on the wide side of the bevel and 3-5/8" on the smaller side of the bevel.
To allow the doors to fold back on each other a Quad door unit typically does not use dummy knobs or levers (normally use a flush pull) .