H13 True HEPA Filter: 3-stage filter safely removes 99.97% of airborne particles as small as 0.3 microns, including mold, allergens, germs, dust, pet dander, pollen, odors, and cigarette smoke. Improved Filtration: Designed with 360° air intake to enhance the air circulation speed and purify the larger space up to 1,100 ft². Easy Replacement: Filters are sealed to keep best performance before Using. Remove filters from plastic bag before placing them into air purifier with a few quick steps. It is recommended to replace filters every 6-8 months to ensure the purification ability. Official Aurora Replacement Filter: Compatible with Aurora AR100W H13 true HEPA filter air purifier to ensure its fitting size and filtration performance.