The PWB-320XL/323XL Wall Boxes are longer versions of the PWB-320/323 Wall Boxes. These boxes are designed to fit 16” or 24” on center stud bays. AV and IT installations are simplified by providing ample space for routing cables, AC connections and digital media product mounting in 3” (PWB-323XL) or 4” (PWB-320XL) thick walls.