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zeynep's profile
zeynep tufekci
zeynep tufekci
zeynep tufekci
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@zeynep

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zeynep tufekciVerified account

@zeynep

Complex systems, wicked problems. Society, technology, science and more. @UNC professor. @NYTimes columnist. My newsletter is @insight: http://www.theinsight.org 

floating in a most peculiar way
theinsight.org
Joined August 2009

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    1. zeynep tufekci‏Verified account @zeynep 15 Sep 2021

      zeynep tufekci Retweeted Marwa Zaatari

      I'm getting questions, so let me highlight this useful chart for selecting a HEPA air cleaner. Also remember: if you can, opening windows is really good. Avoid gimmicks and ionizers. HEPA + CADR (speed at which it cleans the air) is all that you should be looking for.https://twitter.com/marwa_zaatari/status/1433469347973017604 …

      zeynep tufekci added,

      Marwa Zaatari @marwa_zaatari
      This chart has the two CR boxes with 1 filter and 2 filters (name on chart starts with CR) tested by @DavidElfstrom - I updated Smart air for US version (120 V) and Austin air and added 2 more purifiers. - I made a list of all your requests. More purifiers coming very soon. https://twitter.com/marwa_zaatari/status/1432539974596022276 … pic.twitter.com/BUuDMhWLky
      Show this thread
      7 replies 146 retweets 365 likes
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      zeynep tufekci‏Verified account @zeynep 15 Sep 2021

      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 …

      10:34 AM - 15 Sep 2021
      • 127 Retweets
      • 257 Likes
      • lin Jeremy Wadhams Nora Rawn Joshua (((Vanity Unfair))) Juju Bee Michael Rubino Mike Batz Arun Mukherjee
      9 replies 127 retweets 257 likes
        1. margaret richardson‏ @richwellness 15 Sep 2021
          Replying to @zeynep

          Good resourcehttps://cleanaircrew.org 

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        1. Hi! My name is...Chris  👋  🌹‏ @cwark1 15 Sep 2021
          Replying to @zeynep

          Where you put the box is *extremely* important! If it is on the floor along a wall, its impact will be minimal. Breath is warmer than ambient air and rises, so make sure any air purifier used to trap aerosols is elevated and near the breathers.

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        1. Steven Bratman MD, MPH‏ @StevenBratman 15 Sep 2021
          Replying to @zeynep

          Aerosol scientists have conflated "SARS CoV2 is transmitted via aerosol" with "long range aerosol spread is a common (not just possible) form of transmission." No evidence has been presented, and the math is against it. Viral concentration in near-field >> ambient air.

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        2. Tom (mask wearing, aspiring-acolyte) Mitchell‏ @niftymitch 15 Sep 2021
          Replying to @donaldcclarke @zeynep

          The time depends on the pollution level. It is possible to build in a manometer made of aquarium hose and measure the pressure. A U of hose clamped to a ruler lets you measure and watch the back pressure change. Water evaporates,charting only one side like this is error prone.pic.twitter.com/RTM9RRpI5n

          0 replies 0 retweets 1 like
        3. End of conversation
        1. Tom (mask wearing, aspiring-acolyte) Mitchell‏ @niftymitch 15 Sep 2021
          Replying to @zeynep

          The four filters can be stacked to 8 even 12 with one fan. 1”x2” wood frame for strength. Duct tape to make sure air gets filtered. Dispose soiled filters safely, they collect funk.

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        1. Kevin Newman‏ @knewman 15 Sep 2021
          Replying to @zeynep

          I have two mid-range HEPA air purifiers in my home, and the mesh pre-filter layer gathers a significant amount of dust (which I vacuum or rinse in the shower weekly). I worry about the C-R boxes not being as effective over time as the exposed filters clog with larger particles.

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        1. Candlestick Maker 🍁‏ @LiseCandlestick 20 Sep 2021
          Replying to @zeynep

          David Elfstorm is an aerosol engineering colleague of both Rosenthal and Corsi. They each know and approve of each other's work.

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        1. Candlestick Maker 🍁‏ @LiseCandlestick 20 Sep 2021
          Replying to @zeynep

          Follow @DavidElfstrom and @BarryHunt008.

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        1. cc3062‏ @cc30622 21 Sep 2021
          Replying to @zeynep

          how cool is this… never seen corporate offer such an inexpensive solution to anything.

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