Equipped with a permanent filter, this affordable little air purifier is perfect for everyone who does not want to deal with filter changes and replacement costs. The only maintenance it requires is to vacuum the filter 2 to 3 times per year! With a versatile compact design and removable base it can be set up in either a horizontal or vertical position on the floor, desk or shelf. The permanent HEPA-grade filter effectively removes 99% of irritating airborne allergens such as pet dander, dust, dust mite debris, pollen and mold spores down to 3 microns. The True Air Allergen Reducer by Hamilton Beach is an excellent value choice for those who are looking for a compact air purifier that requires minimal maintenance and are primarily concerned with removing allergens from a room up to 160 sq. ft.