Fan was fine for about 5 hours then the noise got crazy.. I answered the phone and someone asked if I was working on farm machinery.. I KID YOU NOT. the noise comes from the washer that holds the fan blades in the electric motor. if you pull the front cover off and push in on the fan while its rotating (Center, not on the blades) the noise stops. apparently the "washer" rubs on the front side of the motor housing and causes the issue. the fan is $20.00 new.. and shipping back for repair (will run about $10.00 to ship back) is a waste of my time. So with that, I shot a 3 pointer into the dumpster with it. I got it for free from Uline because I had a big order.. placed a 2nd big order and got another "vornado" V6.... so I will see how long this one last before someone asks me if I am working on farm machinery when they call.