Let’s clear the air. Blueair genuine filter for 411i Max and 411a Max air purifiers. Blueair genuine replacement filter F4MAX is specifically designed for optimal performance. Not compatible with 411, 411+ and 411 Auto. 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.

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