Keep the air in your room clean with the Coway Air and Sound Filter Set. This filter set includes 1 HEPA filter and 2 carbon filters for odor control. This true HEPA filtration system is designed to capture 99.97% of airborne allergens as small as 0.3 microns in size. This means the HEPA filter will catch pollen, pet hair and dander, household dust, and whatever else is floating in the air around your household. The odor-eliminating carbon filters are designed to eliminate natural odors and gases from the air. These filters are compatible with the AP-0512NH Conway Air and Sound filtration system. You'll be set for an entire year with this pack since HEPA filters are only supposed to be replaced once a year, and new carbon filters are due every 6 months. Improve the quality of your home's air and your life with the Coway Air and Sound Filter Pack. Eliminate natural odors and gases (Food smell, pet smell, Nitrogen di oxide)