Negative Ions and HEPA air filtration system 1.High efficiency 2.Low noise 3.Save energy 4. ... CE certifications Negative Ions and HEPA air filtration system Application:Home, Living room, hotel, school, clinic,hospital, kitchen, warehouse ... ,500 square feet of coverage Function:Remove odors, tobacco smoke, fume, food smell, beverage smell, pet smell.Eliminate dust, pollen, allergy ...