Our top quality fans are IP68, which is waterproof and dustproof. They will, in fact, even work underwater. They are also brushless and have duel ball bearings for vibration free operation. They will also operate at a range of voltages from 9 to 20 volts. They are rated for 100,000 hours of continuous use. Since the actual average yearly running time is estimatrd at just 2,500 hours these fans should last more than 20 years. We tested many fans before we chose these. Most began to wobble or vibrate in a few months. These are the best fans we could find.