This is a beautiful air purifier. However, we've had issues with the night mode. The fan doesn't spin at a constant speed in night mode but alternatives between a low and medium speed. It sounds like a car engine rev. We've had 2 units that have had this same behavior. We expected night mode to have a consistent fan speed. The unit isn't that loud, but the change in sounds is annoying enough that we can't sleep with it on like that. The fix is to shutoff the unit entirely and restart it in night mode. We're not sure where to return the product again and get a third replacement or accept this as a defective product design.
Beautiful design but not working correctly
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