5 SQUARE® Boxes (5″ x 5″ x 2.875″) provide up to 88 cu. in. of interior volume-more than double the volume of a 4″-square deep box. The increased size of 5 SQUARE® Fire Signal Boxes helps eliminate ground faults and short circuits, and 5 SQUARE® Telecommunication Boxes guarantee minimum bend radius, now and for future transmission rate increases over both copper and fiber optic cable.