Built-in device with heat recovery for the ventilation of individual rooms. Aluminum plate heat exchanger with an efficiency of over 70%. State-of-the-art EC motors with the highest efficiency for extremely low energy consumption., Device unit with 3 power levels and inner facade made of high-quality plastic., Fan housing (material: EPP) with 2 highly efficient, energy-saving direct current EC fans, with fly screen. Large aluminum plate heat exchanger with an efficiency of over 70%. Two efficient air filters made of electrostatic material of class G4 in the supply and exhaust air flow guarantee the best air purity. An F7 pollen filter (accessory: item no. 9446) can be used optionally on the supply air side. The condensate is drained outside directly via the outer cover including drip tray. Power is controlled via the control element integrated in the inner facade (3 fan levels). , Technical data: , Delivery capacity of the individual stages: 17/30/60 m³/h, Heat recovery: > 70%, Voltage/frequency: 230V/50Hz, Power consumption: 4 to 12.0 W, Noise level measured at a distance of 3m: 18/22/30 dB(A), Electrical supply cable: NYM-J 3 x 1.5 mm², Weight: 6.5 kg ,