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  1. Last 7 days
  2. Aug 2022
  3. Apr 2022
    1. emma o kelly [@emma_okelly]. (2021, December 6). I was @scoilidepps today looking at ventilation. Built in 60’s with dual aspect classrooms for cross ventilation. Handy outdoor ‘corridors’ too. All designed to prevent the spread of TB. School has also bought HEPA filters for classes. Re Covid it has managed pretty well so far. Https://t.co/KgZgABDeDL [Tweet]. Twitter. https://twitter.com/emma_okelly/status/1467922855333699587

  4. Mar 2022
    1. Shelly Miller, PhD. (2020, December 8). And here is an example calculation showing the difference in indoor virus concentrations with 3 vs. 6 ACH room ventilation when a person shedding the virus hangs out for an hour in that space https://t.co/p7M3boIh2w [Tweet]. @ShellyMBoulder. https://twitter.com/ShellyMBoulder/status/1336410448342736899

  5. Feb 2022
  6. Jan 2022
  7. Dec 2021
  8. Nov 2021
    1. 𝚃𝚘𝚖 𝙻𝚊𝚠𝚝𝚘𝚗 💙. (2021, October 30). From the paper—Ventilation makes a big difference further away, but below 1-1.5m then you’d have to be in a gale to be safe! ✅DISTANCE if you can ✅VENTILATE - works even within 2m, but sadly not so much within 1-1.5m ✅PPE if you have to get close #COVIDisAirborne https://t.co/wYuWdG47He [Tweet]. @LawtonTri. https://twitter.com/LawtonTri/status/1454355692593328132

  9. Oct 2021
  10. Sep 2021
    1. Helleis, Frank, Klimach, Thomas, & Pöschl, Ulrich. (2021). Vergleich von Fensterlüftungssystemen und anderen Lüftungs- bzw. Luftreinigungsansätzen gegen die Aerosolübertragung von COVID-19 und für erhöhte Luftqualität in Klassenräumen. https://doi.org/10.5281/ZENODO.5070421

  11. Aug 2021
  12. Jul 2021
    1. Prof Cath Noakes #Ventilate 😷 💙 on Twitter: “A thread today about windows and ventilation, and some things you can do to make the most of your windows for comfort and infection risk 1/” / Twitter. (n.d.). Retrieved July 19, 2021, from https://twitter.com/CathNoakes/status/1416368008801492994

    1. ReconfigBehSci on Twitter: ‘@Professologue @sciam well it also gives references to documented cases. Why do you think uncertainty means we should not clean? And how is this different from debate (until very recently) about “airborne” nature, in your view?’ / Twitter. (n.d.). Retrieved 15 July 2021, from https://twitter.com/SciBeh/status/1415357732446633984

  13. Jun 2021
  14. May 2021
  15. Apr 2021
  16. Mar 2021
  17. Feb 2021
  18. Sep 2020
  19. Aug 2020
    1. more roof ventilation is usually better.
    2. Space attic vents evenly and mark the locations by driving nails up through the shingles (Photo 1).
    3. Mark the roof venting locations from the attic, where you can see the rafters and avoid placing roofing vents over them.
    4. Place all the roof vents on the same side of the roof. If your roof peak runs parallel to the street, put them on the backside, where they’ll be less prominent.
    5. Grab a flashlight and inspect your attic during the winter. If you see dampness or frost, you need better roof ventilation and some attic vents.
    1. 18:00: Wishes he did insulation on the roof instead of bottom of attic, because having lightly-insulated 55-degree AC ducts going through 150-degree hot attic is energy inefficient

    1. 1000 soft house less than R40 no air sealing needs 7 sq feet of vent 3-1/2 on the roof that’s 504 sq in that’s 10 of those square flat vents or 260 inches of ridge vent. Show less Read more 1 year ago (edited) 2

      1000 soft => 1000 sq ft ?

    2. It is near impossible to get the attic and roof sheathing temperature the same as the ambient outdoor air temperature, due to the radiant heat from the sun. You would need three or four 1500 cfm power ventilators to come close to achieving that goal, at that point you'd be using enough electricity to run a central a.c. unit. Proper depth and type of insulation will do more than any amount of ventilation.
    3. Wide rafters are 24" inch centers, narrow are 16" centers. He used narrower size (used in 16 centers) instead of wider size (not shown) baffles (for 24s). Unfortunately, as is, any blown-in insulation can now go down on either side of the narrower baffle and block the soffit slits necessary for air entry. Should have bought the wider size baffle that fits rafter-to-rafter, preventing any blown-in insulation from clogging the soffit entry slits. Costs a few cents more...
    1. Attic fans work great and sure DO reduce electric bills
    2. A powered exhaust fan will not work without proper soffit venting
    3. As others have said, I think this works better with one fan as an intake, and another an an exhaust to keep the pressure balanced.
    4. Bummer, incorrect and completely inaccurate information regarding attic fans. At least in a dry and hot climate. The more attic ventilation the better. It will extent the life of your roof and WILL decrease your attic temperature.
    5. Any mod or installation if treated as an individual component is a scam. Contrary, a properly balanced and engineered system is beneficial. Attic fans do work, as long as they're incorporated into the ventilation ... as a system.
    6. For me the attic ventilation temp difference of 145 to 110 is significant. I don’t know if you think that is significant but for us it certainly makes a difference in comfort for us. PS Over the thirty years in our home I have replaced the attic fan motor twice. The total cost of those motors was less than 100 dollars over those 30 years. During one season when we didn’t have the ventilation fan running we had a roughly $45-$50 per month increase in our electric bill. (The bill went from $190 to approximately $240 per month). From an energy perspective I guess that is not a lot of money but from a comfort perspective and level of A/C required it seems like a good return in the long run.
    7. I don’t think that I can agree with you about the benefits of a powered attic fan. I live in Springfield, Virginia and I have actually measured a 30-35 degree difference in the attic temperature when that powered ventilator is running as opposed to when it is not running. I have had a comprehensive energy analysis done on my home and I know for a fact that my attic ventilation is not sucking air from our second floor into the attic.
    8. there is a reason us HVAC people if we run into a house that has no ventilation in the attic and equipment is there, we will pull a salvage furnace blower and put it on a gable vent and turn it on for 5 minutes before staying up there for longer periods.
    1. Horby, P., Mafham, M., Linsell, L., Bell, J. L., Staplin, N., Emberson, J. R., Wiselka, M., Ustianowski, A., Elmahi, E., Prudon, B., Whitehouse, A., Felton, T., Williams, J., Faccenda, J., Underwood, J., Baillie, J. K., Chappell, L., Faust, S. N., Jaki, T., … Landray, M. J. (2020). Effect of Hydroxychloroquine in Hospitalized Patients with COVID-19: Preliminary results from a multi-centre, randomized, controlled trial. MedRxiv, 2020.07.15.20151852. https://doi.org/10.1101/2020.07.15.20151852

  20. Jun 2020
  21. May 2020
    1. La ventlation des classes et autres liocaux L’aératon est un geste qui doit maintenant être systématque et durer au moins 10 minutes àShaque fois. Les salles de Slasse et autres loSaux oSSupés pendant la journée doivent être aérés lematn avant l’arrivée des élèves, pendant Shaque réSréaton, au moment du déjeuner et le soirpendant le netoyage des loSaux. En Sas de ventlaton méSanique, son bon fonStonnement doit êtreSontrôlé.
  22. Apr 2020
    1. Greater proportions of patients with cardiac injury required noninvasive mechanical ventilation (38 of 82 [46.3%] vs 13 of 334 [3.9%]; P < .001) or invasive mechanical ventilation (18 of 82 [22.0%] vs 14 of 334 [4.2%]; P < .001) than those without cardiac injury.