Stay away from this product !!! The fan is not worth the money. I have found that the engine alone (without propeller) is already loud and produces a thud to the rubber feet of heavy Fußlatte. (How likely other billi gereren models also). I have a "Asbach-contain ancient Philips fan, which also appropriate (from the engine) noise produced. Take a mobile phone (or similar in my case, an iPad), a dB app and measure the difference betw. Ambient noise with and without fan. The result was: Old fan (max 50W): Level 1: Increase by 1 dB (+1) Stage 2 by a further 2 dB (+3) Level 3 to further 2 dB. (+5) Fan new: Level 1: increase of 2 dB (+2) Stage 2: to again 1 dB (+3) Stage 3: to a further 2 dB (+5) Step 4: to further 2 dB (+7) This is not a precise measurement, but if two devices are in the same distance from the microphone and only the difference is evaluated, you have a good predictive value regarding "Silent" - as touted. Who thinks the part so the bedroom and at level 1 ... who has made a mistake !!! The amount of air Weche "shoveled" we is enormous, but the cheaper Ventis can. To make matters even what has already been reported in other reviews. The leaves are cheaper plastic scrap and vibrate tremendously. After I had directed it on a flat plate with distance-pieces and hot water on the approach of the propeller, was reasonably quiet. A difference of 5 mm from leaf to leaf - madness. The service of this company is to be beneath contempt. Oh ... from the outside looks the part pointed out, that fit into our society (from the outside hui .....) MfG
