Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works Well, but noisy.

Works well for a small room. I am currently using it in my kitchen and if I keep it on all night, I've noticed in the morning all the smells from the night prior are gone where as before the food smell would linger. It is a little noisy, but you do get used to it after a while. If you don't mind a little background/white noise when you sleep then it should work well for you.