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DavidElfstrom's profile
David Elfstrom
David Elfstrom
David Elfstrom
@DavidElfstrom

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David Elfstrom

@DavidElfstrom

P.Eng & Certified Energy Manager, spreadsheet nerd. Born @ 327 ppm CO2. Energizing the conversation on climate & safe infrastructure, cycling, #ventilation

Norfolk County, Ontario
linkedin.com/in/elfstrom/
Joined March 2009

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    1. zeynep tufekci‏Verified account @zeynep 14 Feb 2021

      zeynep tufekci Retweeted Dave DeGrâce, MD

      Canada. Makes no sense to wear masks *except* when you are breathing most heavily. (I know of gyms in the US *still* with similar rules: Must wear a mask to come in! Sanitize your hands before getting on the elliptical! Then you can take your mask off while you huff and puff.🙄)https://twitter.com/DaveDeGraceMD/status/1360943926883057667 …

      zeynep tufekci added,

      Dave DeGrâce, MD @DaveDeGraceMD
      It's disturbing to see that none of the re-opening guidelines seem to consider the variants or aerosol/airborne transmission. Our local skating rink requires masks until you get on the ice surface. The local gym requires masks except during cardio. We've had time to change this
      28 replies 112 retweets 592 likes
      Show this thread
      David Elfstrom‏ @DavidElfstrom 14 Feb 2021
      Replying to @zeynep @skeila

      This really grates my cheese. Rationale is from WHO, Mask use in the context of COVID-19: interim guidance, 1 Dec 2020: "WHO advises people should not wear masks during vigorous intensity physical activity (143) because masks may reduce the ability to breathe comfortably" /1

      11:31 AM - 14 Feb 2021
      • 4 Retweets
      • 18 Likes
      • fanatla (Saint's Fan account/cuenta de fan) Gail Nevin interest_foo George Hagstrom Barry Hunt #COVIDisAirborne 🌬 😷🪟 Jim Crate Christopher Thomas Watson Ladd Gonzalo Lozano
      4 replies 4 retweets 18 likes
        1. New conversation
        2. David Elfstrom‏ @DavidElfstrom 14 Feb 2021
          Replying to @DavidElfstrom @zeynep @skeila

          Check reference 143, "World Health Organization 2020 guidelines on physical activity and sedentary behaviour" 10.1136/bjsports-2020-102955 Nothing about face, mask, nose, mouth, COVID, SARS, infection.... nothing that appears to support the reference. /2

          2 replies 1 retweet 10 likes
        3. Asit K Mishra  😷 🪟‏ @akm5376 14 Feb 2021
          Replying to @DavidElfstrom @zeynep @skeila

          Not using mask could adversely impact your or others ability to breathe, period.

          0 replies 0 retweets 1 like
        4. End of conversation
        1. New conversation
        2. Jim Dunn  🟠‏ @UrbanHealthProf 14 Feb 2021
          Replying to @DavidElfstrom @zeynep @skeila

          Is learning not possible? Why is it so difficult? Huge outbreak at spin club just a short distance away in October.https://www.cbc.ca/news/canada/hamilton/covid-19-spinco-outbreak-graphic-1.5767688 …

          1 reply 2 retweets 14 likes
        3. David Elfstrom‏ @DavidElfstrom 14 Feb 2021
          Replying to @UrbanHealthProf @zeynep @skeila

          It's so absurd. Faced with this massive spin club outbreak what did the province do? It increased the distance for group aerobic activity from 2m to 3m. Still permitted to remove masks.

          1 reply 0 retweets 10 likes
        4. Show replies
        1. Ari Jankelowitz‏ @ajankelo 14 Feb 2021
          Replying to @DavidElfstrom @zeynep @skeila

          This is horrible. Get a reusable mask http://patientknowhow.com  or Aaron collins has great data. Many effective masks with min. effect on breathing (pressure drop), don't collapse in on breathing, and have excellent filtration > 90%https://docs.google.com/spreadsheets/d/1ZEK83iVm380-p1ODJ3j5iHyHtNugLPdxmnMLhvbb8DQ/edit?usp=sharing …

          0 replies 0 retweets 1 like
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        1. Peter in PRG 🌍‏ @peterinprg 14 Feb 2021
          Replying to @DavidElfstrom @zeynep @skeila

          I don't think Wuhan Health Organization has any credit left to recommend anything regardless if they are right or wrong, no point quoting then anymore, discredited for years.

          0 replies 0 retweets 0 likes
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