The Advanced Pure Air Newport 5000 Filter Set is a direct-from-the-factory replacement filter set. A High Efficiency Particulate Air (HEPA) filter can achieve a removal efficiency of over 99.99% for particles larger than .3 microns. It?s created specifically to remove dust and inhalable particles. It can capture and trap 99.99% of airborne allergens and bacteria, such as dust, smoke, pollen, pet dander, bacteria and mold spores. Activated Carbon Filter Activated carbon may remove many odors and chemical substances in the air with highly effective absorptions particles. With thousands of pores, each particle can provide a large surface area to absorb volatile organic compounds (VOCs) and offensive odors in the air we breathe, and chemicals in the air. One layer is coated with Nano Tio2, so it has strong sterilization and virus removal capacity. The other layer is coated with a high-efficiency remover of formaldehyde.