Blueair - Blue Pure 411+ Pre-Filters Select Filter Colour:Buff Yellow Prefilter theirs involves immersing chunks of

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Blueair - Blue Pure 411+ Pre-Filters Select Filter Colour:Buff Yellow Prefilter theirs involves immersing chunks ofInfo: Stretchy Coloured Fabric Pre Filters for the Blue Pure 411+ (411 Plus); in Limited Quantity These fabric prefilters cover the outside of the Blue Pure 411+ air purifiers. They are intended for use exclusively with this model and are available in four colours. Which model? Blue Pure 411+ air purifiers feature a metal housing when you pull the fabric down. Blue Pure 411 Auto prefilters are available separately. Product Notes: In a marriage of