Membrane Solutions MS18 Air Purifier, Washable Pre-Filter with H13 True HEPA Air Filter for 413 Sq Ft Large Room, Reduces 99.97% Allergies Pet Dander SmokerThe Membrane Solutions MS18 air purifier features a washable pre-filter and 3 stages filter (H13 True HEPA + Activated Carbon + Ion Capcher) that captures and reduces up to 99.97% of particles as small as 0.3 microns in the air, including dust, pet dander, pet hair, pollen, cigarette smoke, odors, VOCs and more. (Note: HEPA Filter is unwashable)A CADR of 110CFM makes it ideal for home living rooms, bedrooms, offices, nurseries, and kitchens. It covers 825 square feet/77 square meters in 60 minutes and 413 square feet/35 square meters in 18 minutes.It only produces 20-30 decibels of noise without disturbing your sweet sleep. The rugged pre-filters keep your air purifiers and HEPA filters performing even better.The MS18 air purifier perfect fit for home living rooms, large family rooms, bedrooms, offices, nurseries, and kitchens.825 square feet/77 square meters in 60 minutes.1 Pre-Filter(Washable) with 3 Stages HEPA Filtration System(Unwashable)Reduces up to 99.97% of particles as small as 0.3 microns in the airRemove dust, pet dander, hair, pollen, cigarette smoke, odors, VOCs, and more.Quiet Operation only 20-30db of noise.A HEPA air filter could be used for more extended time