premium meets or exceeds leading national brand. Suggested to replace every 6 months for best performance.,100% customer satisfaction d. Dimension: 1.9 x 8 x 11.1 inches. Nispira premium filter set suitable with Blueair Blue Pure 411, 411+ & MINI Air Purifiers.,High premium HEPA filter capture 99.97% of airborne particles down to 0.3 microns.,Activated charcoal filter helps deodorize any unfavorable household smell,4 Filter included
