Improve the indoor air quality of your room with the Blueair 403 air purifier that uses a HEPA filter. The filter blocks pollen grains, dust mites, mold spores, pet dander and more for fresher, cleaner air. It"s able to capture up to 99.97% of particles as small as 0.1 micron. The unit draws in air for purification with the help of a silently operating fan. It has a programmable timer that shuts it off at the preset time. CADR certified. Suitable for room sizes between 300 and 500 square feet. Replacement filter included.