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This system perfectly fulfills its role in places where there is a very small distance from the edge of the roof.
End and intermediate points can be attached to steel, concrete and other materials. A high-quality rope with a diameter of ø8mm is stretched between the supports. A trolley is attached to it. A person equipped with Personal Protective Equipment is attached to the trolley.
Such a solution guarantees in a safe way, for example, a review of fans, or safely reach the crane.