Febreze Replacement Dual Action Filter 2-Pack FRF102B With Odor Reducing Carbon Pre-Filter Nullify Imported HEPA-TYPE FILTER FOR FEBREZE AIR PURIFIERS: This 2-pack of replacement filters captures up to 99% of microscopic particles 2 microns and larger, from the air that passes through the filter. The HEPA-Type filter has a built-in odor reducing pre-filter. ODOR REDUCING PRE-FILTER: These dual action HEPA-Type air filters are designed specifically for Febreze Air Purifiers. A built-in carbon pre-filter helps capture larger airborne particles & reduces unpleasant odors such as those from pets, cooking & smoke FEBREZE AIR PURIFIER FILTERS: To keep your Febreze Air Purifier performing at its best, so the air in your home is fresher & cleaner, change your air purifier's filters every 4 months. For best results, choose Honeywell replacement air purifier filters. FEBREZE AIR PURIFIERS: Use Genuine Febreze filters in your air purifier to help remove allergens, dust and airborne germs. If you have allergies or pets, air purifiers do more than freshen air, helping remove airborne particles and improve air quality. FEBREZE QUALITY: Use Genuine Febreze Replacement filters with your Febreze Air Purifier for best performance. Each air purifier's performance is tested as a system with the filters to ensure best efficiency. Also try Febreze Air Purifier Scent refills!