To make it short: "This fan is crazy part." The structure is a breeze and done in 5 minutes with only a Phillips screwdriver. Then comes the big 'aha' experience. Almost noiseless wind power already at the stage 1 of 4 is so strong to maximum as with some other fans. In the turbo stage 4 is meant to stand on Nordeseestrand. For me it has definitely freed on 3 meters from the single, complete desk of all papers. Due to severe Stand the unit is fixed always absolute. A clear and 100% buy recommendation from me to all who are looking for a real powerful, solid verabeiteten and almost noiseless fan.