First of all, the article description does not match 100%. Instead of the expected 500 this hood creates loud packaging print only 4000m³ / h. The Verabreitung is simple but functional and probably appropriate for the price. The engine in this unit in a metal case, is also at level 2 already relatively loud in my device. At level 3 you get the feeling that a small plane takes off. The installation is very easy because the entire unit is suspended on two bolts and supplied with all necessary equipment incl. Simple dowels and screws. Conclusion: who is high-tech and extravagant design preference with this device ill advised. Those looking for a functional hood that will not break your wallet is right here.