The employ of EC fans means to have a plant with high efficiency, further improved by the using of a speed controller which ensures optimum management of the fans for the best possible performance of the liquid cooler not only in terms of capacity, but also of noise emissions. Moreover, in this particular context, it is necessary to have a lowest noise level, in order to grant to the residents the maximum comfort. For this reason, on the fans were installed particular diffusers, named Axitop, that increase to make the dry cooler even more silent.