COVID-19: Improving ventilation reduced likelihood of infection by 80% in schools
A preprint study found the relative risk of infection decreased with the increase in ventilation for those equipped with mechanical systems ( arxiv.org/abs/2207.02678 ). H/T: @linseymarr 🧵1/
A preprint study found the relative risk of infection decreased with the increase in ventilation for those equipped with mechanical systems ( arxiv.org/abs/2207.02678 ). H/T: @linseymarr 🧵1/
The study investigated more than 10,000 classrooms in Italy. Ventilation rates ranging from 10-14 L/sec per person reduced the likelihood of infection for students by 80% compared to classrooms with only natural ventilation. 2/ 
They determined that relative risk was reduced 12%-15% for each additional unit of ventilation rate per person. 3/
The researchers conclude that "We need high ventilation rates (> 10 L/sec per student) to protect students in classrooms from airborne transmission; this is higher than the rate needed to ensure indoor air quality." 4/
In Brisbane, Australia a primary school was able to remain outbreak free during their Omicron wave so how did they do it ( abc.net.au/news/2022-04-0… )? H/T: @nathalie_k1 5/
A group of interdisciplinary fathers got together with the principal and used science and engineering knowledge to prevent the COVID-19 virus from spreading through classrooms. 6/
Using a smoke machine, they studied airflow patterns in the schools' classrooms and administrative areas. CO2 monitors were used to identify low-ventilation areas. 7/
The school invested in HEPA filters and CO2 monitors for every classroom so they could clean the air and monitor ventilation conditions in real-time, sounding alarms if CO2 levels get too high. 8/ #LongCovidKids #onted
Engineer Joey Fox has put together numerous guidance on ventilation including:
- Engineering Methods to Mitigate COVID =
9/
- Engineering Methods to Mitigate COVID =
https://twitter.com/joeyfox85/status/1550510970224709632
9/
There is even an entire book that describes the airborne behavior of aerosols and how they float and accumulate in indoor air for hours in a new updated 2022 edition (
https://twitter.com/kprather88/status/1551369876442296320). 13/
Is an 80% reduction in likelihood of infection and monitoring to ensure ventilation systems are functioning properly too much to ask for to protect your students and staff? @OttCatholicSB @OCDSB @ecolecatholique @MonCepeo @OPCouncil @ETFOeducators @osstf @OFLabour
#FASSST
14/
#FASSST
14/
Info to help fact check school board claims on ventilation (
https://twitter.com/joeyfox85/status/1550525676092006402). 15/
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