October 7, 2016 HEPA filters are deemed compliant based on the way they are tested. They’re tested by third parties; no manufacturer can test their own filters. In the United States, there are specific labs to send filters to that are government regulated, and they have to test the filters under ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) standards. These standards are constantly being worked on based on the medias that are available.
Engineered Filtration Systems
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