The Alen T100 Desktop Air Purifier"s compact design cleans the air of allergens and harmful airborne pollutants in smaller areas. A great solution for workspaces, countertops, bathrooms or even for travel. The Alen T100 Desktop Air Purifier features HEPA (High Efficiency Particulate Air) style filtration, combining three layers of filter technology to purify and freshen the air in your home. Polluted air first passes through Alen"s washable Pre-Filter to capture large particles, extending the life of the filter. In the second layer, air moves through a unique, electrostatically charged HEPA style material that attracts and captures dust, pollen, pet dander, mold spores and other airborne pollutants. In the final layer, clean air passes through a layer of Alen"s Activated Carbon, reducing light odors and chemicals commonly found in the air from cleaning products, smoke, cooking, pets and various other household materials. The T100"s ozone-safe Ionizer complements the HEPA style filter by charging particles in the air, causing them to stick together and become more easily captured. The Alen T100 quietly circulates all of the air in a 125 square foot space more than twice per hour on the highest speed. It comes standard with the HEPA-Fresh filter, designed for easy replacement. We recommend regular filter replacements (at least every 6 months with normal use) to extend the life of your air purifier and maximize performance for pure, breathable air. As with every Alen Air Purifier, the Alen T100 includes a Lifetime Limited Warranty.