This is by far the quietest Air Filter system I have ever used. Shark has outdone themselves! I love the LED display and the multiple setting options. This unit is small but powerful.  The design is simply beautiful and will look great in any area of your home or office. Because of it's small size it does not take up much space so you can place it just about anywhere. This Shark Air Filter is also so quiet I cannot hear it, I mean that literally. It is virtually silent.  It has been working great for me so far, I wake up feeling much less stuffy , my eyes are not as watery. I know it's doing its job. I love it and highly recommend  for anyone  with allergies or if you just want to make sure you are breathing cleaner Air.