Investing in the best-selling air purifier is a great decision for improving air quality, but to ensure it always functions properly, it's essential to maintain and clean it regularly. You should read the instructions carefully, pay attention to the filters, and vacuum the exterior too. If you're looking for the best HEPA air purifier for a classroom, check out Medify Air, a leading company that offers a convenient and hassle-free shopping experience, as well as great customer service.