Amazon.com: BLUEAIR Blue Pure 211i Max Genuine Replacement Filter, Blue Pure F2MAX, fits Blue Pure 211i Max Air Purifier : Home & Kitchen
Blueair Blue Pure 211+ Auto Archipelago Sand Pre-filter in the Air Filter Accessories department at Lowes.com
Classic 500/600 series particle filter | Blueair
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Amazon.com: BLUEAIR Blue Pure 211+ Auto Genuine Replacement Filter, Particle and Activated Carbon, fits Blue Pure 211+ Auto Air Purifier : Home & Kitchen