Blueair - Filters for Blue Pure 311 (NON-Auto version) Select Product:Arctic Trail Prefilter Many of us need a

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Info: 24 cm Diameter

Blueair - Filters for Blue Pure 311 (NON-Auto version) Select Product:Arctic Trail Prefilter Many of us need aInfo: Choose Either Main Combination Filter; Or Pre Filters (in Several Colours) These are the two types of replacement or supplementary filters needed exclusively for the relatively rare manual (i. e., non automatic) version of the Blueair Blue 311 Air Purifiers (which are a slightly different size from the Pure 311 Auto): the main filters, which combine a white, pleated outer layer to capture particles and an activated carbon layer in the middle for