PUR131 Replacement HEPA FilterH13 True hepa technology: filters 99. 97% dust, pollen, smoke, odors, mold spores, and pet dander. The air filters catch particles as small as 0. 3 microns 3 Stage Filtration System: H13 True Hepa, fine preliminary filter, and high quality activated carbon filters reduce unwanted odors in your living spaces. Perfect for anyone wanting to improve air quality Properly sealed: filters are sealed to protect their lifetime. It is recommended to replace air