I chose and bought, unfortunately according to the reviews . In fact, the fan was very noisy. All other functions work fine, but the noise. That was the criterion by which I chose this fan. At first speed, it immediately turned out that the blades were threshing through the air. The higher the speed, the more this noise becomes, and the air flow is not strong. This means that the propeller of this fan is incorrectly calculated. It's a pity. The heat will end, I will sell. And here's another conclusion . Over the past six months, this is the second purchase according to reviews that deceived my hopes