I purchased it for our town's newspaper office. I work as an editor about once a month and am allergic to the formaldehyde produced from the printer's ink in the large photo copier that runs off over 300 copies of the paper. I can now work in the office a day after the 'run' if the purifier has been kept on all night. I no longer have to air the place out by opening windows or setting out plates of cut up onions! A great purifier.
Jennifer