Also, the picture in the above tweet is a Corsi-Rosenthal box. You can make one for about $100 and in 20 minutes (a box fan, A/C filters you can buy for cheap + duct tape) and it will work just as well as the expensive machines. Here are the instructions:https://www.wgbh.org/news/local-news/2021/08/17/diy-air-filters-for-classrooms-experts-are-enthusiastic-and-a-citizen-scientist-makes-it-easy …
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A related question - are air hand dryers in washrooms good or bad from a Covid aerosol perspective? I would think they are bad as they would make a mockery of the 6 foot rule as the air is going to be all mixed up and aerosols dispersed in the room.
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I worked in a hospital and never saw an air dryer , maybe this is whyhttps://www.healthline.com/health-news/study-finds-air-hand-dryers-can-spread-more-germs-than-paper-towels#What-the-study-found …
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Here in California we have been having quite an uptick in bad air days. So we just bought our second Coway. Buy this brand and you will be satisfied, imho.
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Have you done Swiss IQ Air ? Seems they are on of The top ones.
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Not wanting to spread misinformation… I thought I read that opening windows had a very limited improvement on air quality and that it comes nowhere near comparable to a well working hvac system that turfed air exchange… I’d still recommend opening windows but…
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“The report also found that opening windows to improve ventilation “did not appear to have a significant positive impact” in the schools, adding that the issue was more pronounced at St. Raphael.”https://toronto.citynews.ca/2021/02/20/carbon-dioxide-levels-at-tcdsb-school-regularly-exceeds-recommended-limits-study/ …
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