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Air filtration and COVID-19: Indoor air quality expert explains how to keep you and your building safe - U of T Engineering News
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PROTECT COVID-19 National Core Study | How effective are HEPA air filters at reducing risk of respiratory virus spread?
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Can 10× cheaper, lower-efficiency particulate air filters and box fans complement High-Efficiency Particulate Air (HEPA) purifiers to help control the COVID-19 pandemic? - ScienceDirect
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