Bests & Worsts Reviews from Amazon

UPDATE: I am editing my review of this product from 2 to 5 stars. After contacting Pure Enrichment regarding the fan noise found in my original unit, Pure Enrichment sent me a replacement unit at no charge. I almost never see excellent customer service like this anymore. I received my replacement unit just in time to assist with the smoke coming from new fires in Utah. I couldn't be happier and can recommend the purchase of this HEPA filter for anyone needing such a device. ******************************************************** Because I live in Utah, we are currently experiencing abnormally high amounts of wildfire smoke pollution. This pollution is coming from California and Utah wildfires. At times, the smoke outside is so heavy, there is a noticeable odor inside as well. My HVAC has a high-end HEPA filter as well as UV. I purchased the PureZone Elite "Ultra Quiet" 4-in-1 filter to help with the smoke odor that gets past my HVAC. It removes the odor extremely well in the room in which it is placed. However, there is a very faint, but noticeable "whine" from the internal fan(s). It sounds vaguely like the fan bushings on an exterior AC heat exchange whose fan is worn out. While the noise isn't usually disturbing or irritating, it is loud enough to make the filter unsuitable for use in my bedroom at night. The noise would keep me awake. I'm wondering if any other purchasers have the same issues. I have requested feedback from the manufacturer regarding this issue and will update this review once I have it. This filter deserves 5 stars, but I can only give 2 if this fan noise is to be expected.