Air handling unit for room air exchange with high efficiency heat recovery (~90%) and for summer dehumidification. The housing is made of steel plate. Fresh air intake flow‐rate and supply air flow‐rate are handled separately (partial recirculation of air is possible). The fresh air flow‐rate can be set from 80 to 140 m³/h, while the supply air flow rate can be set from 160 to 300 m³/h. Possible operations include fresh air ventilation, air recirculation, freecooling, boost, dehumidification as well as integration of summer and winter sensible capacity. UC 300 V2 is designed for horizontal ceiling installation, and it is equipped with a complete cooling circuit (with refrigerant R290), pre‐treatment coil, plate heat exchanger with ½" modulating valves to be supplied with cooled water (15 °C), EC high efficiency modulating fans, 1 motorized damper automatically regulating the recirculation flow, and G4 filters (ISO coarse 60%). Optionally, the machine can be equipped with 2 additional motorized dampers to avoid annoying outdoor air draughts. The unit can be managed with User Display, with an external device (via digital input), or with RDZ Wi electronic control unit.