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The biggest medical failure of the pandemic was denying that COVID is airborne.
The biggest engineering failure of the pandemic was not providing a clean air delivery rate required for mitigating airborne disease. That failure has been addressed. We now have good values. 🧵
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The biggest engineering failure of the pandemic was not providing a clean air delivery rate required for mitigating airborne disease. That failure has been addressed. We now have good values. 🧵
1/6
ASHRAE 241 Draft Review (Not finalized)
10-90 liters/second/person, depending on the risk of the environment.
Equivalent ACH was calculated based on occupant density in other standards. Higher density increases equivalent ACH.
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osr.ashrae.org/Online-Comment…
10-90 liters/second/person, depending on the risk of the environment.
Equivalent ACH was calculated based on occupant density in other standards. Higher density increases equivalent ACH.
2/6
osr.ashrae.org/Online-Comment…
@O_S_P_E - minimum of 6 air changes per hour (capped at 2.7m/9' ceiling)
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https://twitter.com/joeyfox85/status/1599576650840055813?s=20
These rates are all pretty similar. The ASHRAE rates are slightly different because they use per person and it can significantly affect ACH from occupant density. Overall, they are all in agreement that current rates are way too low. The clean air revolution is under way.
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