Steel sheet enclosure, white painted; internal components made of EPP. Inlet and outlet duct connection ports compatible with nominal diameters of 100 mm and 125 mm. 2 x EC brushless motors, each coupled to a centrifugal impeller; 3 speeds. High-efficiency counter-flow type heat exchanger. Mechanical automatic by-pass, 100% filtered. Advanced electronic suite, easily accessible for first setting and ordinary maintenance operations; functions offered: operating parameters setting (fan speed, relative humidity threshold, etc.), automatic management of the by-pass, no-frost protection of the heat exchanger, automatic management of the (optional) pre-heater, if installed, operation at Vmax inhibition in a pre-set time slot, which can be set at installation (QUIET function); a back-up battery ensures constant updating of the time marked by the clock (RTC - Real Time Clock), even in case of power failure, possibility to automatically switch to Vmax, linking it to bathroom lighting (BOOST ROOM LIGHT function), possibility of managing the automatic switch to a reduced speed (30% less than Vmin), useful to grant the correct air exchange during the long absence of occupants, also limiting consumption (HOLIDAY function), filter status monitoring: the need for cleaning / maintenance is shown on the remote control panel display, possibility of connection to a presence sensor (PIR), able to automatically manage the switch to Vmax. 2 x ISO COARSE 45% (G3) filters, on extracted air (stale) and on (fresh) air supply; ISO COARSE 65% (G4) filter for extraction port, ePM10 50% (M5), ePM1 55% (F7) and ePM1 80% (F9) filters for supply port are available as optional. Condensate collection vessel with overflow protection.