I am very pleased with the preformance of this product. No sound and it works wonderfully.

Received items as promised and works as listed. Had to replace an older unit and these units work just like new ones. Will buy again, to replace the other units in the future.

This a refurb of a new kind of air cleaner that doesn't have a fan, so makes no noise and has no filter to clean, and it's easy to use. It is all that, and now people with dust allergies can be in our downstairs, so it works.