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1/ In 1858 Max von Pettenkofer, a significant historical figure in the #IAQ field, wrote -

“If there is a pile of manure in a space, do not try to remove the odor by ventilation. Remove the pile of manure.”

Wise words! (more)
2/ During this pandemic we should do everything possible to eliminate or minimize infected individuals in buildings. This means testing to the extent possible, perhaps using thermometry/smell tests if advanced testing is not possible. (more)
3/ Lower density. 1/2 occupants = 50% chance that source is present. Educate to not come to work or class if not feeling well or if had close contact with someone else with COVID-19. See more at link. Thanks to @ProfCharlesHaas for leading effort!

medium.com/@haas_33533/co…
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Dr. Richard Corsi
@CorsIAQ
1/ All gr8 points made by @Poppendieck. Knows his stuff! I've recommended in several forums, including today, to stick to proven technologies. In the case of portable air cleaners, that means those with HEPA filters. As Dustin says, avoid "add ons". Stick to HEPA. (more)
2/ Any portable air cleaner (PAC) that is worth considering should have a stated Clean Air Delivery Rate (CADR). Those that do not, probably don't for a reason. The CADR is usually certified (in North America) by AHAM - aham.org. (more)
3/ CADR is the product of 2 numbers (eta x Q). Eta is the single-pass removal efficiency for a pollutant (fraction of pollutant removed with one pass through a PAC). Q is the volumetric flow rate of air (e.g., standard cubic feet per minute [scfm]) through a PAC. (more)
Read 9 tweets
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Dr. Richard Corsi
@CorsIAQ
1/ Thanks, Linsey. I have some concerns about public anxiety regarding HVAC systems & recirculation. First, it is just not feasible for many across North America to have supply air be 100% outdoor air. In some systems more outdoor air and less recirculation through effective
2/ filtration might actually be counter-productive. Temperature and RH affect rate of virus inactivation and are more easily controlled w/ recirculation through HVAC systems. Further, rates of outdoor air intake may be limited in some systems, whereas multiple passes through .
3/ a good filter may be highly effective at removing particles that contain viruses. Even if some viruses are transported through a mechanical system and are not captured on a filter or otherwise deposited there can be substantial dilution.
Read 12 tweets
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Dr. Richard Corsi
@CorsIAQ
1/ Return to university (part A)

I have heard from faculty at universities across the US about what their universities are planning for return to school in just over a month.
2/ I am fascinated by the large spectrum of actions that will be taken, or in some cases frightened by actions that will not be taken, to assure the health and safety of their university communities. We will learn a lot from this grand experiment. What worked and what did not?
3/ Which universities took actions that protected their on- and off-campus communities, and which failed? To be sure, there will be COVID-19 outbreaks on university campuses across the US. Some people will die, and the local community around a university will be impacted.
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