Blueair 303 HepaSilent Air-Purification System Energy Star air purifier with HEPASilent technology 5 air changes per hour for rooms up to 210 square feet CADR rating of 135 for smoke, dust, and pollen; 3 speeds Galvanized steel construction; 100-percent-recyclable filter media Measures 10 by 17 by 21 inches; 5-year limited warranty