This Hamilton Beach Allergen Reducer helps clean and freshen indoor air by fighting dust, mold spores, pet dander, pollen and other allergen particles. These high performance allergen reducers are the easy way to improve indoor air quality and are affordable additions to your office, bedroom or den. Hamilton Beach Allergen Reducers are lightweight, compact and easy to transport from room to room. These popular air filtering products are effective and efficient, utilizing powerful filters that are easy to clean. Built with Good Thinking in mind, the permanent filter only needs to be vacuumed two to four times a year, so you never have to touch a dirty filter again.