Abstract: A cooling stack for a cooling tower comprises at least one volumetric polymer block of a flow-around type. Each block is built up of polyhedron shaped cells. The blocks are mounted in the cooling tower by means of connecting strips strung up on suspension devices suspended to a carrying construction disposed inside the cooling tower. Each block comprises at least two flow-around type layers. The layers are arranged in the block vertically at a distance one above the other. Each layer is made up of rows of cellular components, mounted detachably by means of connecting teeth to connecting seats in small carrying bars. The small carrying bars are mounted to the connecting strips strung up on the suspension devices which are divided by spacing sleeves.