Best room air purifier I've ever had. This thing is a game changer for me, with my allergies. Man, the air is so much clearer and cleaner in my office when this is running. Thinking about getting a 2nd one for another room. Lo = quiet hum (not totally quiet, but quiet enough). Med = definitely audible, but more effective. Hi = kinda loud, but really scrubs the air totally clean in 15-20 minutes. So I like to let it run on high for 20 minutes and then put it on low for the remainder of the day while I'm working.Update: just bought a 2nd one of these for the bedroom. Allergies almost gone! Great product, well worth the investment.
Rating: [5 of 5 Stars!]