The only time you hear it running is when it is on high and the only time it's on high is when the air quality is bad. I have two cats and when they scratch themselves you can see fine hair come off of them. The air purifier clears the air pretty fast. I'm very happy with this purchase.
I bought this air purifier for my daughters house which is more like a pet shop. Dogs, Cats and birds everywhere. What an amazing difference this has made in her life.
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