blueair in fast. quiet. simply smart. blue pure 311i max air purifier hepasilent™ dual filtration technology maximum filtration, minimum noise. effortless customization four fabric pre-filters and three primary filters to choose from. simply smart simple two button control intuitive voice… is up for auction in Appliances. The current bid is $4.00, in Good Condition. This auction has ended — similar items appear in live auctions regularly.