【4-STAGE FILTRATION】Equipped with a 4-Stage Filtration system including TRUE HEPA Filter, Pre-filter, Activated Carbon Filter, Fabric Layer.This air purifier filter can effectively capture dander, pet hair, cooking odor, cigarette smoke and large dust particles around your living space, in addition to remove all airborne contaminants as small as 0.3 microns, with zero harmful Ozone emission. 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.