won bong air purifier 3 filtration 360 degree 49.5m2, 99.9% removal performance - healing wha320 won bong technique to eliminate deadly ultra fine dust! please give your family a clear and pure indoor air. the ruhens air purifier keeps the family happy. pm1.0, which can cause various respiratory diseases and health problems, as well as bacteria, life odor and germs are thoroughly removed, and clean air is sent away to make the indoor space more comfortable.360 ° grille rotation cleaning function the 360 ° grill rotation of the cleaned air maximizes the air circulation throughout the room by maximizing the distance from the top to the left and right.