Buying any refurbished item usually scares me away due to quality concerns. Gladly, Blueair includes the same warranty on their refurbished units as they do on their brand new ones, and they extend that warranty when you register the unit online! It does a great job filtering a large room, especially when I replaced the HEPA (white) filters with the odor removal (charcoal) filters. There is almost zero maintenance needed, except for an occasional dusting of the outside of the unit and filter changes every 6 months, but ours has been able to maintain effectiveness even longer. I highly recommend this product and have purchased two 400 series (bedroom airflow) sized units as well.
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