The Blueair 603 is the largest unit in the product lineup that is not an "E" model (it is right below the 650E). This purifier delivers high CADR ratings (400 for dust and 450 for smoke and pollen).
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It utilizes three filters and has the option of a standard HEPASilent particle filter or a SmokeStop filter upgrade which incorporates extra activated carbon. In this unit, this upgrade would provide 6 lbs of activated carbon (2 lbs per filter).
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