I choice this air purifier because my ENT Doctor told me to get a purifier with the true HEPA filtering system. And oh my gosh, this is a good one. It has everything he said to get and boy, does my house smell cleaner. I have asthma, fireplace and animals and this purifier really helps me breath better. It doesn't take up a ton of room and is nice and quiet too. And it looks good too. Thanks Shark for another great product.