The True HEPA tabletop allergen remover can help capture up to 99.97% of airborne allergens and particles. Honeywell True HEPA Air Purifiers are efficient at capturing airborne pollutants like dust, pollen, pet dander, mold spores, tobacco, cooking and fireplace smoke particles. The Honeywell True HEPA Tabletop Air Purifier Also helps reduce odors and VOCs. The compact size is perfect for small rooms in the home office or nursery. This air purifier uses a mechanical filtration process meaning that the fan pulls the particle-filled air into the unit and forces that air through a HEPA filter. Effectively cleans and circulates the air in small rooms (90 sq ft) up to 4.8 times an hour. This air purifier works with the Honeywell A and A+ Pre-Filter. The Pre-Filter is the first level of filtration and helps capture large particles such as dust, lint, fibers and pet fur and helps to reduce VOCs and odors from cooking, smoke, bathrooms and pets. This filter should be replaced every three months. The filter check/reset light will remind you when it's time to change your filter. Initial filter included. To ensure stated product performance, use only genuine and certified Honeywell replacement filters.