I received this air purifier a week ago and have been using it everyday. I have it in the living room since that is mainly where the family gathers. We live on a dirt road and have a lot of dust in the house regardless of how much we clean and dust. There are three settings for fans and hours. I've been keeping it on high fan setting for 6 hours. It seems to be working since my son who has allergies hasn't really showed a flare as bad this week. The fan is kind of loud on high but you get used to it pretty quickly. So far so good.