Plastic (PPE) fire-resistant enclosure (DIN EN 13501). Brackets for wall-mounted installation supplied as standard. Front panel made of plastic resin, integrating covers for filters direct access. Round duct connection ports, nominal diameter 150 mm. 2 EC (brushless) motors, external rotor, with shaft turning in ball bearings to grant a “maintenance free” functioning, each coupled to a backward curved centrifugal impeller; 2 speeds, independently adjustable at the installation. High efficiency counter-flow heat exchanger in PS resin. Automatic frost-protection to prevent icing on the heat exchanger. 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. 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 show time and room temperature; to monitor the correct product operation (any faults are shown on the display); to show the filters status. 2 M5 filters (F7 filter for air supply duct available as optional), easy access for periodic maintenance. Condense water tray with discharge pipes. Possibility of connection to environmental external sensors (available as optional), for automatic functioning control.