High-efficiency filtering function: Equipped with a 4-Stage Filtration system including Pre-filter, Activated Carbon Filter, TRUE HEPA Filter,  Fabric Layer.This filter can remove all airborne contaminants as small as 0.3 microns, with zero harmful Ozone emission. can effectively capture soot particles produced in wildfires, It also effectively captures exhaust gas emitted by automobiles in the air, ultrafine particles around your living space. It is perfect for pet owners, babies, children, the elderly, or anyone wanting to improve the air quality.It is recommended to replace your filter every 6-8 months depending on the use and air quality.