The RNW 411 dehumidifier is used to control the relative humidity of the room in floor, ceiling and wall radiant cooling systems. It is a complete refrigeration unit, condensed with water and equipped with pre-condenser coils and water-gas heat exchanger, which are fed by a hydronic connection to the water coming from the radiant panels. It has a galvanized sheet structure and is installed horizontally in false ceilings. It includes a 3-speed direct coupled centrifugal fan and a power connection box supplied with PCBs. This is a very compact unit, which is particularly quiet and therefore suitable for residential applications.