Base enclosure AX, steel sheet. The compact AX enclosure features integrated enclosure positioners on the roof, floor, and sides, forming the well-known 25 mm system grid pattern of the VX25 large enclosure. With this unique, patented system, AX compact enclosures are prepared for all types of configurations and retrofits. System components and accessories can be easily, quickly, and securely installed and retrofitted on rails without the need for drilling.