Blueair 270E Air PurifierOverview Innovated with love in Sweden, the Blueair 270E is small in size but big on delivering quiet and efficient air cleaning for rooms up to 240 square feet using powerful HEPASilent technology, which combines the latest in mechanical and electrostatic filtration. Key Features Warranty: 5 years Designed for small rooms up to 22 sq. m or 240 sq. ft. in size. Patented HEPASilent filtration technology. Certified 99. 97% filtration efficiency without