Great product! My elderly mother bought this for herself. She had me come over and install it for her. I personally didn’t believe that it was going to make a different in her health but helped her out anyway. It was easy enough to get going. Within a week my mother was commenting on how it was easier to breathe. I visited her and she seemed a lot healthier. Since it worked so well for her, I bought one for my home. I’m very pleased with the results. I recommend this product to the elderly, breathing problems or allergies because it seems to work.