Very nice small unit

This little purifier looks good, has three fan speeds, and a "ion" mode that can be turned off. The HEPA filter gets changed every 6 months and costs $20. To get the "lifetime warranty" you need to sign up for a filter delivery program. This may not be too bad if you use the unit all the time, but it is not too clear how to stop the program once initiated. My first unit was noisy, so I requested a replacement. The replacement arrived promptly, and works well. On low fan setting, it is very quiet. Higher settings circulate a LOT of air, and should be good if you have a serious problem.

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