... beam, roof cover board, tension ring, ventilator scoop, roof cap, etc. The space age construction technology, which is adopted ... accoring to your requirement.5. Ventilation SystemVentilation for Flat bottom silo Ventilation System includes Natural ventilation vents,Suction Fan, ... can produce various kinds of steel silos of flat-bottom or hopper-bottom (all are available to the customers' demandings and ...