MD Anderson Guide for Air Purifiers against the COOF!
(www.mdanderson.org)
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My dentist was showing off his new counter top filter that cleaned the room air is so many minutes. The room was about 10x10x10. I told him that to force all the air in the room through a filter tight enough to filter out something as small as the alleged virus would a motor three times bigger, and five times as loud.
It was my last dental visit.