Encrustations and refractory material on the walls of the kiln inlet chamber and the preheater often break off during cleaning work and represent a considerable danger for employees and infrastructure when they fall into the depth. Our innovative system minimizes this danger efficiently: our protective structures based on hightensile steel wire mesh arrest up to 1'000 kg when falling from a height of 10 meters and ensure sustainably the danger zone for workers. The system, including brakes, is particularly easy to mount in the riser duct and can be completely installed by just three persons within half a day with just a handful of tools.