Nispira F7400 Protect 7400 SmartFilter Replacement 3 in 1 HEPA Activated Carbon Foldable Blueair Protect 7470i, 7410i Air Purifier Remove Smoke, Dust, Chemical Smell Item Package Quantity:1 it is recommended to replace 12137 it is recommended to replace the main filter every 6–12 months and clean or replace the pre filter every 2–3 months depending on usage and environment • Dust• Household debris• Pet dander• Common indoor particulates These trademark holders are not affiliated with Nispira or its website Nispira 3 in 1 HEPA filter replacement with activated carbon compatible with Protect 7400 series air purifier with model number 7470i and 7410i