CHR 350-FC mechanical ventilation unit with heat recovery system made of aluminium, with high efficiency counter-flow heat exchanger, designed for small- and medium-sized residential buildings, either single-detached dwellings or in block of flats. The frame is made from aluzinc steel, internally insulated with 40-mm thick rockwool. The unit is also fitted with two high-efficiency fans, one on the air supply and one on the air return, and it is designed for horizontal false ceiling installation. The machine is equipped with G4 filters while F7 filter may be inserted, as a an option, on the supply line. The filters ensure the protection of the heat recovery device and offer excellent filtration of the new air introduced into the room. The CHR 350-FC mechanical ventilation unit includes by-pass for free-cooling and condensation drainage kit. The unit may be also combined with the DWF 400 dehumidification unit in order to obtain fresh air ventilation together with dehumidification in the summertime. CHR 350-FC is also provided with a soft touch control panel to be installed either built-in or externally on a 2-module box, model 502 (supplied as standard), for managing the unit and displaying information.