About this item

• GENUINE FILTER: For 311i Max air purifier; genuine F3MAX Replacement filter for 311i Max is designed for optimal performance; Not compatible with311i+ Max or 311 Auto
• LET'S CLEAR THE AIR SMARTER: Get more out of your filter; Our proprietary RealTrack algorithm calculates filter lifetime based on actual usage and pollution levels and tells you when to replace within 9 months; Subscribe to save
• LET'S CLEAR THE AIR FASTER: HEPASilent dual filtration technology delivers more clean air faster and uses less noise and energy than HEPA filtration alone*
• LET'S CLEAR THE AIR BETTER: Removes at least 99.97% of tiny airborne particles like viruses and smoke down to 0.1 microns. and captures pet dander. pollen. mold allergen and dust; Carbon filter traps light household odors from smoking. pets and cooking**
• MOST AWARDED AIR PURIFIER BRAND IN THE US***: Independently tested for performance. Zero Ozone; AHAM Verifide for Performance (CADR); Quiet Mark Certified; Ozone Safety Standards Certified by CARB; Zero Ozone Verified (<5 ppb) by Intertek Sustainability

Let's clear the air. genuine filter for  311i Max air purifier.  genuine F3MAX Replacement filter for 311i Max is designed for optimal performance. Not compatible with  311i+ Max and 311 Auto.

Get more out of your filter. Our proprietary RealTrack algorithm calculates filter lifetime based on actual usage and pollution levels and tells you when to replace within 9 months. Subscribe to save on auto-delivered air purifier filter replacement.

*When similar CADR was measured. Blueair models with mechanical and electrostatic filtration achieved less noise with less energy than same models with only H13 HEPA mechanical filtration. **Tested PM 2.5 (0.1 - 2.5 microns) up to 90min in a 30m3 room. Tested to remove min. 99.9% of S. aureus. K. pneumoniae. P. aeruginosa. MS2. E.Coli. H1N1. A.Niger. ***Based on a survey of over 50 awards. accolades. and recommendations issued by independent consumer associations. media publications. and industry competitions from January 1. 2022. through January 31st. 2023. for products sold in the US by top 10 air purifier brands according to NPD Group Retail Tracking Service. Small Appliances. U.S. sales dollars Jan – Dec 2022.