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The truss-rail system is utilised in Venlo greenhouses. This drive system is mounted on the trusses or around the pillars. The ventilation windows are driven via THG rack and pinion systems, which are in turn powered by a GW motor gearbox, the heart of the drive system. Pull/push tubes, push bars and drive tubes constitute the connecting components.
Air inlet valves are often used in stables. The air inlet valves are driven by winch drums or TGA racks, which are in turn powered by a GW motor gearbox, the heart of the drive system. Steel cables constitute the connecting components.