I use this air purifier in my office to keep allergens and dust out of the air. I have been using it for about a week and so far, I am pleased with the results. It has three levels of air flow. I started using the highest setting but the machine was VERY loud so I typically keep it on the lowest setting now. I feel like it works well and the design makes it easy to use in just about any room. The only issue I have with it is how loud it is.