FLEX-RACK Dual system FLEX-RACK Dual system is an aluminum-based ballast-type solar structure for flat roofs. This structure comes with pre-assembled sub-assemblies, catering to fast and easy installation. The structure is completely made of high-grade metal to provide continuity for earthing. This first-in-class ballast system is capable of handling a wider range of panels (300Wp to 670Wp). A low base is designed to maintain a minimum of 100mm ground clearance from the roof. The structure is designed to sustain a wind speed of 55 m/s or 200 Km/h.