For use with 1 ½", 2 ½" fire dept. valves and portable fire extinguisher. 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. All components are powder-coated with an electrostatically-applied, thermally-fused, recoatable white polyester finish. Wall mounting: semi-recessed. Inside box dimensions: KxLxM: 18x24x8 inches. Minimum wall opening required: 19 x 25 x 6½ inches.