Conair - Medium Room Air Purifier is a versatile air purifier which does the job well. You can use it vertically or horizontally. It is really quiet, especially if you use it in the low or medium setting, you can barely hear it. Having used air purifiers before and having an asthma problem stemming from indoor allergies, I can confidently say that this air purifier does its job. It has a HEPA filter and also it can ionize the air if you would like to. I would recommend this air purifier.