Coway Replacement Filter Pack for AP-0512NH 1 Year Replacement Pack: Includes 1 HEPA filter (replace once a year) and 2 carbon filters for odor control (replace 6 months) HEPA Filtration: Designed to capture 99.97% of airborne allergens as small as .03 microns in size Odor Eliminator: 2 carbon pre-filters designed to eliminate odors and gases from the air These filters are designed by Coway to fit in AP-0512NH