Accommodates a 2 ½" (6.4 cm) fire dept valve with cap, chain and a portable fire extinguisher on shelf above the valve. Regularly furnished: 20 ga. box, 20 ga. tubluar steel door with 18 ga. frame and a continuous steel hinge (brass pin). Recessed, semi-recessed and surface mounted cabinets are furnished with 0.125"(0.31 cm) radiused frame. Wall mounting: semi-recessed. Inside box dimensions: KxLxM: 14 x 40 x 8 inches. Minimum wall opening required: 15 x 41 x 6½ inches.