The Blueair 503 Air Purifier is AHAM certified for rooms up to 580 sq. ft. and captures 99.97% of the tiniest 0.1 micron particles on level one. Includes allergy-provoking pollen grains dust mites mold spores and pet dander particles using patented Hepasilent technology. Our Swedish design is not only attractive but built to last. We are known for our durable construction that is made of galvanized steel and is powder coated for durability and environmental protection. As air is drawn into the unit via an ultra-quiet fan airborne particles pass through an ion chamber and are charged to ensure that they adhere effortlessly to Blueair s progressive three-stage filter cleaning the air in your room 5 times per hour. The Blueair 503 continues to deliver outstanding performance that has withstood the test of time all while exceeding energy efficiency standards set by Energy Star. Dimensions 26 L x 20 W x 13 H, 35 lbs.