I have had this fan for five years, leaving it on 24/7. I never turn it off. Every 6 months i do have unplug and take apart to clean the dust out running the blades under the sink to wash clean. You do have to maintain and keep clean if you want it to keep working. Its quiet and puts out plenty of air. If you smoke, nicotine will gum up the blades and motor making it harder to work. Clean it and it will keep working.