Product Details： for Holmes air purifiers models: HAP412, HAP422, HAP424, HAP702, HAP706, HAP716, HAP1702, HAP2400, HAP9240, HAP9241, HAP9242, HAP9243, HAP9412, HAP9413, HAP9414, HAP9415, HAP9422 HAP9423, HAP9424, HAP9425 Also fits Bionaire model air purifier: BAP260, BAP520, BAP815, BAP825, BAP9200, BAP9700.   Features: 1. HEPA-Type filtration effectively removes up to 99% of smoke and pollutants from the airstream; 2. Captures allergens and pollutants as small as 2 microns; 3.Made of Cotton;Powerful carbon air filter replacement is enhanced with baking soda uses charcoal with oxygen to create tiny pores between the carbon atoms to trap odors and pollutants; 4. Helps control odors from pets, bathrooms, garbage, nurseries, and kitchens; 5.For best results change every 8-12 months.   Package includes: 2 (two) replacement HEPA filters; 2 (two) replacement carbon booster sheets.