?H13 4-Stage Filtration True Hepa Filters , 4-Pack | | ?Compatible With Puurvsas (Hm669A) / Rovacs (Rv60) Air Purifiers | | ?H13 True Hepa Capture 99.97% Of Airborne Dusts Pm2.5 Down To 0.3 Microns In Size. Remove Large And Airborne Particles, Including Dust, Common Pollutants ,Activated Carbon Reduce Chemicals Vocs, Tobacco Smoke, Pm2.5,Common Household Bad Smell | | ?Please Replace Regularly To Keep Your Machine Fresh And Clean. For The Best Performance, Clean The Filter Once A Month With A Soft Brush Gently Or With A Vacuum Cleaner. | | ?Top-Notch Quality Used For Maximum