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![Joseph Allen on Twitter: "8/ Four air changes per hour of dilution plus cleaning is good, five is excellent, and six is ideal. https://t.co/av1VQxSjOG" / Twitter Joseph Allen on Twitter: "8/ Four air changes per hour of dilution plus cleaning is good, five is excellent, and six is ideal. https://t.co/av1VQxSjOG" / Twitter](https://pbs.twimg.com/media/EiMR5liWsAYysq8.jpg)
Joseph Allen on Twitter: "8/ Four air changes per hour of dilution plus cleaning is good, five is excellent, and six is ideal. https://t.co/av1VQxSjOG" / Twitter
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Joseph Allen on Twitter: "SCHOOLS. Target 4-6 air changes per hour (ACH) in classrooms using any combination of these three: 1. Outdoor air ventilation 2. Recirculated air through MERV13 filters 3. Portable
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