Airthereal Day Dawning Purifier, ADH50B

We use this one-room unit in our first-floor home office. (We also have a filter on our central heating and a large semi-portable filter in the full basement.) The purpose of our unit is to reduce the amount of dust around our computers. We have also purchased a unit for each of our sons for Christmas presents, and we have had a unit shipped to our niece in Washington state to use in her new baby's room due to the forest fire smoke. The tubular filter has a large surface area for the size of the unit. The fan speed we use creates a modest white-noise sound somewhat like the sound of a light rain on the roof. The box of replacement filters (for the ADH50B unit) says "HEPA", "Removes 99.97% of dust, pollen, smoke, and odor" - it does not list viruses. Opinion: Will afford moderate protection for our sons and for the baby and currently protects the computers and equipment. Not medical grade. This is a table-top, ONE ROOM (bedroom sized), single filter device, 10+" x 6" x 6". It is not for an open-concept, multi-room-sized area. Nor is it a multi-stage, semi-portable unit like I have in our large basement area...and it does not claim to remove viruses like the superior filters I use on our central furnace/air system.