Ø 100mm / 4'' Heat Exchanger Designed for Efficient Transportation of Hot Air Integrated Thermostat with a Temperature Range of 10-30°C for Precise Temperature Control Powerful Fan with a Ball Bearing Motor for Effective Air Circulation and Heat Distribution. Automatic Fan Activation when the Temperature Exceeds the Desired Range, Promoting Efficient Heat Distribution Fan Automatically Turns off when the Room Temperature Drops, Conserving Energy and Ensuring Comfort Backflow Flap Mechanism Prevents Undesired Mixing and Ensures Optimal Air Flow Direction 20 cm Duct for Optimized Air Passage and Through-wall Mounting / Ventilation Grille for Secure and Aesthetically Pleasing Installation Technical Specifications: Voltage: 220-240V / 50Hz, Power: 7W, Rotation Speed: 2000 RPM, Air Flow: 65 m3/h, Noise Level: 26 dB(A), Diameter: 103mm Made in Europe