.... Exactly how I wanted it! I air in winter so energy efficient complete my apartment !! Here's how: window, wind machine on the inside's windowsill, so this fresh air blows into the room, the power consumed (hot) air from escaping up the window. Now I just need max. 5 minutes and the room is fully aired !! The advantage: All items and furniture in the rooms still have their heated temperature and enter this now to fresh air, so that the room in no time has its room temperature! It would be wrong: open windows, ventilate 20 to xx minutes, while everything has cooled in the room and the radiators must consume energy to everything again bring to room temperature. Unfortunately, there was the large model (50 cm 120 watts) of Arendo not, this should be in stock, I'm going to immediately order a !! In summer, with 10 meters distance from the porch swing and I have a fresh breeze. .... By the way, the part is wind machine, hence the noise is purely physically higher, anyway, this model (35 cm) even at level 3 still pleasant in the volume. Device is very stable and does not vibrate in !!!! Therefore full points
