When you don't have a lot of space, a mini desktop air purifier is absolutely perfect! We not only have allergies year round, but also COPD, so having purified air will help with all of that! I am actually very excited to have this next to us while we sit in our recliners and watch TV. You can replace the filter when it is time. It has a 3-stage filter so it catches more of the particles that would otherwise go into your lungs! Clean air means a more healthy life. This has a true HEPA filter, so it takes out 99.9% of the dust and particles from the air that you are breathing! Perfect for me!