There are many benefits to air purifiers/ozonators. HEPA filters are especially important in that they remove contaminants in the air. I found a website called www.filtrationtek.com. They have a wide variety of ozonators and air filter units that work very well and cost less than the conventional brands. I have one myself for 2 years now and it is so easy to clean and maintain. It works excellent. Whenever I walk into my bedroom the air always smells clean and fresh. As far as air cleaners go, this website has it all. Air filtration at it’s best.