Galvanized and painted sheet steel enclosure. Aesthetic front panel made of plastic resin (ABS). Internal components made of EPP. Round duct connection ports, nominal diameter 160 mm. 2 EC (brushless) motors, external rotor, controlled at constant airflow, with shaft turning in ball bearings to grant a “maintenance free” functioning, each coupled to a forward curved centrifugal impeller; 4 speeds, independently adjustable at the installation. High efficiency counter-flow heat exchanger in PS resin. Automatic, 100% filtered, mechanic by-pass, granting people comfort in the rooms in mid-season or when the outside temperature does not require the action of the heat exchanger. Automatic frost-protection to prevent icing on the heat exchanger. 3 x ISO Coarse 90% (G4) filters, respectively on extraction, supply ports and for the by-pass. ePM10 50% (M5) and ePM1 55% (F7) filters available as optional per the supply port and for by-pass. Condense water tray with discharge pipes. Wired control panel with LCD display, which allows: to switch on / off the unit; the first set-up; to set the speed; to set the weekly timer; to monitor the correct product operation (any faults are shown on the display); to show the product functioning (speed set, by-pass status, defrosting activation, pre and/or post heaters activation if installed); to show the filters status. Brackets for wall-mounted installation supplied as standard. Possibility of connection to environmental external sensors (available as optional), for automatic functioning control. Possibility of integration in home automation environment through ModBus protocol.