2 Pack 311 Auto Filters Replacement, Compatible with Blueair Blue Pure 311 Auto Air Purifier, 2 in 1 HEPASilent and Activated Carbon Filter

PERFECT FITCompatible with air purifier | NOTE compatible with Blue Pure 311. ( Blueair 311 Auto and Blueair 311 are different models that use different-sized filters) | True Air FilterOur 311 Auto replacement filter made of air filter and a high-efficiency activated carbon filter for good clean filtration and performance | OPTIMAL PERFORMANCE MAINTENANCEFor the ongoing top performance of your Blue Pure 311 Auto Air Puri-fier, based on actual usage the filter should be replaced within 9 months | SUPERIOR QUALITY311 Auto replacement filter is made of high-quality non-woven activated carbon and can adsorb 99.99% of air particles (with a diameter as small as 0.03 micrometers)