I bought 2 of these fans (at different times) to use with an air filter as a DIY air filtration device. There is quite a bit of dust that comes in through my windows (no air conditioning in my place). The fan with an air filter attached move the air around my apartment and filter out a great deal of dust. I clean the filter once a month (it is reusable/washable) and I breathe a lot easier now. I leave them running at the lowest speed when I am at home and only turn them off when I leave my apartment. They have never overheated or stopped working. They do move some air at the highest speed, shakes a little (the feet really help to stabilize them), and make a bit of noise on the highest speed but at the lowest speed (which I have them at) you can watch tv without having to raise the volume too high.