I paid 50% of the listed price because it had a persistent squeaky sound. Turned out the fan blade was rubbing the internal electrical wire. Once corrected, the unit worked flawlessly. On low the unit generates noise above my threshold for night time sleeping, so I run it during the day only. The noise is from the powerful clean air being expelled from the air purifier. Very strong fan unit. I can feel the filtered air five feet above ground. Great unit and purchase.
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