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When it comes to mitigating wildfire smoke, AHAM recommends a unit that has a Smoke CADR equal to the size of the room in square feet, which ensures that all the air in the room will pass through the filter at least 4.8 times in a given hour while the machine is running on high

(This comes from Association of Home Appliance Manufacturers, which certifies purifier performance, or via the CADR data used in Energy Star certification.) We then confirm by calculation that it can deliver at least four air changes per hour, or ACH, for the sizes of rooms its meant to operate in

The unique construction of this Blueair unit puzzled us at first, as we thought the entire filtration system was missing