BC SOCIETY
Saved by @WebbDarrrel

The GOOD: CDC supports improving ventilation in schools

The BAD: it's buried in their new guidance

The SOLUTION: let's unbury it and make sure every school knows about

 Item #1 in the report (yes, #1), lists 5 key "Mitigation strategies to reduce transmission in schools"

It doesn't say 'ventilation', but it does say 'cleaning and healthy facilities'. I use 'healthy buildings' for header when talking ventilation, so this looks promising...

2/
Sure enough, if we click that 'cleaning' hyperlink, it takes us to this CDC page with the title that *does* say ventilation

https://t.co/YlKvTCRslQ

3/
And, on this page, if you scroll down, you find the section on ventilation

(yes, now you can see why I say ventilation is buried. Instead of details, we get yet another link...)

4/
Alright, when we finally click 'ventilation in buildings', we get to this page which actually has the detailed info on ventilation and filtration (side note: this took ~10 months for CDC to produce this page, even though we knew this last winter...)

https://t.co/DTZSadFd29

5/n
And here's the good news - this page is actually full of good information on ventilation, filtration, portable air filtration, demand control ventilation, de-densification...

6/n

https://t.co/DTZSadFd29
There is yet another link, but this one I have no issues with.

The topic of ventilation gets simplified (I try to keep it simple too so as not to lose people). But, like all things, the details get technical. CDC does right thing here and links to org that focuses on this

7/n
They link to ASHRAE - the group that focuses on ventilation. They go much deeper.

(if you work in schools, this is the doc that you'd hand-off to your facilities team - they'll 'get' this language and what's in it)

8/n

https://t.co/SA3Vwb2vte
Alright, back to the new CDC guidance document again.

Later in the doc, they do actually mention 'ventilation' by name, this time in the expanded "cleaning and healthy facilities" section.

It's at the bottom, buried, but it's there...

9/n
They don't give many details beyond 'open windows', and no mention of filtration, which is a big miss.

Again, though, CDC uses a link for more details. The 'ventilation' link here goes directly to page I just mentioned that has lots of good info

10/n

https://t.co/DTZSadFd29
Yes, ventilation/filtration needed to be more prominent with more details on the schools page. But, to be fair, they use links for all other topics, too.

Look at the 'water' recommendation - super thin, like ventilation - and addressed through linking to more info

11/n
To be clear, I want to see ventilation more prominent. As I told @apoorva_nyc, "CDC gives lip service to ventilation in its report, and you have to search to find it.”

Schools needed this info directly and upfront, not buried several links deep.

12/n

https://t.co/WPhW8eyYZG
CDC should have done what we did - make an entire section of schools guidance focused specifically on ventilation.

I think our section on "Healthy Buildings" is still the best guidance out there on this topic (if it wasn't, I'd pull it down)

13/n

https://t.co/obCEIdxC9L
There's an important topic I wish CDC addressed (and, frankly, where ASHRAE and others have come up very short, too).

Saying 'more ventilation', as these groups do, is not actionable unless you give a target

--> We recommend 4-6 air changes per hour for classrooms

14/n
These 4-6 air changers per hour can be achieved through any combination of ventilation+filtration. We recommend this prioritization:

1: increased outdoor air
2: better filters on recirc air (MERV13)
3: portable air cleaners w/ HEPA

15/n
I also had hoped CDC would go deeper into the recommending portable air cleaners. On the good 'ventilation for buildings' page, the do mention air cleaners, but it doesn't show up directly on the schools page, as it should.

16/n
To help figure out what size air cleaner to buy, use this tool we built w/ @ShellyMBoulder

--> Enter the size of your classroom
--> Enter the device's clean air delivery rate

The tool then tells you how many air changes per hour you are getting

17/n

https://t.co/oJ530G4Mfc
If you want more on 'clean air delivery rate', check out this great post by @CorsIAQ.

18/n

https://t.co/I0rhmNPWZC
So, in summary, the new CDC guidance on schools comes up short on details on ventilation/filtration.

But, it is there, if you follow the links.

My fear is that many won't, and that means that CDC failed in that regard.

19/n
.@jenkinshelen and I covered the ventilation shortcoming w/ in a recent op-ed on the new CDC guidance.

But...ventilation wasn't the major issue in this report.

The community spread metrics they chose, and the targets, are deeply flawed

20/n

https://t.co/r1K1ZPMihZ
Sticking to #HealthyBuildings and ventilation+filtration and what schools can do to improve the situation quickly, all of this has been written about extensively.

My team at Harvard has many resources for you: https://t.co/kzObWYPzqc

21/n
And I have many terrific colleagues who put out detailed information on all of these topics. If not already, follow: @CorsIAQ @linseymarr @ShellyMBoulder @jljcolorado @HuffmanLabDU @stephensbrent @IAQinGWN @WaringIAQ @kprather88 @CathNoakes @marwa_zaatari @Don_Milton + many

22/n
To close the thread...

The tools exist. They have for awhile. CDC now has them on their site, they're just buried.

Help us to continue to unbury them.

**Shared air is the problem, not shared surfaces**

--END--

https://t.co/OThTqtiSYg

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in the past when I’ve thought about this I’ve thought about it from the perspective of my own safety/comfort. And I’m good on that front; I can handle it. But now I’m thinking about it differently: thinking about the people who tell me they join or stay on twitter because of me.

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