My wife has Asthma and Emphasymia and we use the air filter to remove dust and other particles in the bedroom so she can have a comfortable nights sleep. It is quiet and effective and Highly recommended. She has noticed a change and sleeps more soundly with the filter in operation. Its only downer is it emits way too much light at night.
Placed in the bedroom, husband suffers from allergies. Excellent results! Lights are a little bright for sleeping. Would love to have a dimmer switch to turn them down!