The Sharp FP-A40UWRB Refurbished Dual Action Plasmacluster Air Purifier with HEPA Filter captures 99.97% of particles as small as 0.3 microns from the air that passes through it for rooms up to 200 sq. ft. Bacteria germs mold spores pollen pet dander smoke and dust can make breathing harder especially for asthma and allergy sufferers. This air purifier helps remove these irritants with an ultra quiet fan that draws air through a three-stage filter system. Washable pre-filter traps dust dirt and other airborne particles from the air that passes through it. Active carbon filter removes many common household odors and gases. This filter system plus the revolutionary Plasmacluster Ion Technology for air purifiers makes the air healthier and cleaner smelling. The FP-A40UWRB Air Purifier is ideal for bedrooms and living rooms. It's a smart way to choose cleaner healthier more breathable air.