True Hepa Tower Allergen Remover Can Help Provide Cleaner, Fresher Air In Medium To Large Rooms (4.8 X Air Changes Per Hour In A 200 Square Feet). It Captures Up To 99.97 Percent Of Microscopic Airborne Allergens And Particles, Including Dust, Smoke, Pollen, Pet Dander And Mold Spores. Activated Carbon Pre-Filter Helps Capture Large Airborne Particles And Reduces Odors And Vocs. Slim Profile Allows It To Be Placed Anywhere, Even In Tight Spots. Portable Unit Uses A Mechanical Filtration Process. The Fan Pulls Particle-Filled Air Into The Air Purifier And Forces That Air Through A Hepa Filter. Tower Comes With Two G Hepa Filters And One A Pre-Filter.