Air purifiers may work to some degree, but filtration is far more effective in getting rid of mold in the air. An air purifier with a HEPA filter works best, along with reducing humidity levels. When you search for air filtration systems online, there is a big chance you have come across the term HEPA. You might even be inundated with ads for window fans with HEPA filter or HEPA filter for window air conditioners. If you are wondering what HEPA is or how it works, you are frankly not alone. HEPA is an important part of air filtration systems and is also gaining popularity. Therefore, it is crucial that you understand what it is, how it works, and how it can benefit you before you decide whether it is right for you or not.