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Lazarus Long Profile picture
@LazarusLong13
Aug 11, 2021 • 29 tweets • 14 min read • Read on X
A mega thread on the ultimate DIY air filter known as the Corsi/Rosenthal Box (@CorsIAQ/ @JimRosenthal4).

Take it into work. Donate a couple to your school classroom if they'll let you.

Illustrations beautifully done by @ughberta, discovered through @kprather88.

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But my little angels don't transmit CoVid!?

They have ACE2 receptors, which SARS-COV-2 targets.

They get it and transmit it.

And those little bodies have a thermal plume wafting CoVid up to you.

. link.springer.com/article/10.100…
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Always a typo, no matter how many times you go over it....

Sorry - @Poppendieck has a great FAQ here - used up above!



Another classic FAQ is one maintained by about 10 aerosol scientists.


poppendieck.com/IAQ/COVID19%20…
tinyurl.com/FAQ-aerosols
Above...about 40,000 tweets ago, you mentioned 5 microns...and seemed excited about it. Why?

Respiratory aerosols (emitted when we breathe, talk, laugh, yell, sing, cough, sneeze) carry SARS-COV-2.

And 85% of them are 5 microns or smaller.

Corsi/ Rosenthal boxes in action!

Classroom








Used for wildfires:


For STEM fair





Used for Bacon. Gets it's very own tweet. Mmmmm. Bacon....

For sports palace.


For no reason given
















Pulling this up into the thread for optimum visibility.

Thank you, David!

(A great follow!)
A great resource for clean air:

Your lungs will thank you!

Next tweet...this is the hand sanitizer for the lungs you've always needed. Just without that bad smell...

This spacing is really excellent.

The one thing I would change, based on @Poppendieck's recommendation is to flip the box to be pointed up.

So any dried respiratory aerosols (carrying SC2) on the ground are not lifted off the ground (re-aerosolized).


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Would these help in a hospital with already great ventilation?
(H/T
)

Yes.

Preprint, but Dr. Marr is serious money:



Great discussion of why they still help in such already great ventilation:


And that tweet author is the lead on this study showing basically the same:


Same study, but a great tweetorial, too.

Ontario, Canada bringing in 20,000 portable air cleaners.
Someone asked how to dispose of the filters.

Put on your N100 elastomeric respirator (more comfortable than N95).



Carefully, pick up the Corsi box and gently take it outside.

Since you used painter tape, gently peel it back to get the fan off.
Separate the filters and gently place in a garbage bag. Do not shove them in as might have virus in them and don't want the garbage bag blowing the virus back on you.

Tie the bag tight. Toss into garbage.

Make new box!

Why not spray disinfectant on it?

Because by the
time the garbage bag degrades the virus will have been activated...

nejm.org/doi/full/10.10…
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Corsi/Rosenthal Thread Update:

Some folks, (mostly teachers) cannot bring in an air cleaner. But can bring in a fan.

Here's a fan that has a filter built into it! So, a stealth air cleaner.

"Lasko FF305 Air Flex 2-in-1 20-inch Box Fan and Air Purifier in One with MERV10 Image
Air Purifying Filter"

Won't be as good - but something is better than nothing!



H/T @kprather88 for this. She is NOT endorsing it - I am just thanking her for the knowledge of its existence, and I am the one suggesting it would make a great stealth one.walmart.com/ip/Lasko-FF305…
The filters here: are 13-A - so I would buy one and swap out the MERV 10 that it comes with.



No affiliation, just these are hard to find.
@Al_pha_Q2 @CorsIAQ @JimRosenthal4 @ughberta @kprather88 @CathNoakes might require slower air to do its job. Not as familiar with that tech, so happy to stand corrected if wrong.
@Debbie_Winslow_ @ManTh1ng @tafkak @CorsIAQ @JimRosenthal4 @ughberta @kprather88 @DavidElfstrom But ...I am NOT the expert here, so if any of the actual experts could "like" the above tweet, or otherwise correct my ruminations, I'd be most appreciative :). .
@Karthik07720496 @CorsIAQ @JimRosenthal4 @ughberta @kprather88 improved by implementation of 2 portable air cleaners.

Dr. Schofield's excellent study here - with an explanation of why:


And yes, it will reduce virus transmission by removing the respiratory aerosols that carry SARS-COV-2.

&

@dgurdasani1 @laineydoyle @DavidElfstrom @fischelfe @CorsIAQ @JimRosenthal4 @ughberta @kprather88 @CathNoakes @Poppendieck But round fans are addressed here with some examples:


Overall FAQ here - includes all build instructions for 5/4/2/1 filter versions. (Actually working on finishing up the 5 version).

cleanaircrew.org/boxfanfilterfa…
cleanaircrew.org/boxfanfilterfaq
Mega Corsi/Rosenthal Box Thread Update:

David Elfstrom has done a fantastic triangle filter build with estimated CADR.


It, along with everything else, is now in the FAQ:


One of the FAQ's is the Gallery - check it out!
cleanaircrew.org/boxfanfilterfa…
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Mega Corsi/Rosenthal Box Thread Update - Adding the Baskett Box (3 filter build).

Wow! An update to the Mega Corsi/Rosenthal Box Thread that kind of went a little viral.

Here's a fan that has a filter built into it! So, a stealth air cleaner.

"Lasko FF305 Air Flex 2-in-1 20-inch Box Fan and Air Purifier in One with MERV10."

Next tweet - a surprisingly Image
good performance.

I AM impressed!

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More from @LazarusLong13

Lazarus Long Profile picture
May 18
A two week puke cruise from South Hampton to the Canary Islands with 3,077 other guests, 1,205 crew members, and 1 apparently greedy cruise ship company (?) -@pandocruises.

How does a 5 HOUR WAIT to call the ship doc sound?

H/t @FriedmanJas

pocruises.com/find-a-cruise/…

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The situation on the ship with capacity for 3,192 passengers was described as ‘terrible’ and ‘serious outbreak.’ The bug has allegedly plagued Ventura for more than a month, with staff thinking it was gone after each cruise before the bug returned to wreak more havoc among guests and some crew. Guests allegedly face a five-hour wait to call the ship’s medical centre because of ‘so many cases.’
The norovirus outbreak has been going on for 5-6 WEEKS.

How does people throwing up in the public spaces sound?

How does 250, most def an undercount, infected passengers sound?

Ah, @pandocruises? Besides doing the deep cleaning? Image
Norovirus is airborne.

Why not offer your passengers and crew FFP2s/N95s, and suggest they eat outside - until the outbreak is over?

Or....bring in a bunch of HEPAs for the dining room? In between the tables? Plus the N95s.

Read 4 tweets
Lazarus Long Profile picture
May 18
Dr. Marr wrote this. I respect her immensely, but completely disagree on this topic.

- She does not know the ventilation/filtration of every airport. She does not know who was just sitting in that spot moments before you found it. Aerosol stability, physics of aerosols, Image
speed of ventilation/filtration all agree with me on this. The Australian Church study of 45 feet transmission facing away agrees.

- On airplanes - the Harvard Aviation Public Health Initiative (APHI) disagrees with her, indicating masks are necessary

abcnews.go.com/Politics/covid…
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- On coughing, she might not be aware of the 58% presymptomatic transmission.

-Overall, she might not be aware of the:
✅ 38% LongCovid risk after 3 infections.
✅ It only takes one virion to start a covid infection (tight transmission bottleneck).

We can disagree, but still
Read 4 tweets
Lazarus Long Profile picture
May 17
This is a 🧵 that cuts through this CDC school guidance like the thread used in Netflix show "The Three Body Problem."

Their guidance will cut down the kids just like were cut down in the show.
Let's start with their tweet. It provides a framework to evaluate their actions against their words.

- preventing spread of infectious diseases.
-benefiting ALL students.
-maximize school attendance.

Let's start with preventing spread.

-Maximize school attendance
While preventing disease
Benefits all students is highlighted
The single most efficacious way to prevent the spread of infectious diseases is wearing respirators, as they stop both near and far field aerosols.

Are they mentioned in the intro page linked to? No. Masks are, but are buried.

People are logical.
cdc.gov/media/releases…

Teach and reinforce proper hand washing and respiratory etiquette. Take steps for cleaner air by improving ventilation in schools. Schools should consider ventilation enhancements and design when undergoing remodeling or when undertaking new building construction to optimize clean air. Clean, sanitize, and disinfect, when appropriate. Promote vaccinations for students and staff.
Long red arrow showing way down the page where masks are buried
Read 36 tweets
Lazarus Long Profile picture
May 15
These folks refuse to give good real-life advice on how to clean up Hantavirus droppings.

And here we go - a shed with pressed board flooring and mouse droppings.

If I mop? Floor gets ruined.

If I blow it out with safety goggles and an N95 on?

Safely clean. And I
/1


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didn't have to pull everything out to get it done.

Real world aerosol-based solution versus a laboratory fomite-based solution.

@WADeptHealth - join us in the real world where viruses are airborne via aerosols - THROUGH THE AIR.

Or don't and let me gain followers by pointing
out your many many mistakes.

I would prefer to have no followers, and you putting out aerosol-based solutions.

But until then...thank you for being yet another useful tool to let me "gain clout."
Read 11 tweets
Lazarus Long Profile picture
May 14
CDC Influenza A monitoring is up.



They compare to last year's influenza season, and if up 80%? Begin investigating.

There are some latency problems with this, but let's ignore that.

Let's look at the geographic location problem. cdc.gov/flu/avianflu/h…

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The thing is? While it's great to have this effort beginning, it is only covering 600 sites.

For Texas, it is Randall and Potter Counties. And there may be more than one wastewater treatment site in those counties.
Mdp showing Randall and Potter County as wastewater location for Texas panhandle.
Pic showing Randall and Potter County as popup context for map
I walked through every chicken and dairy outbreak from a preprint study that yielded county names.

(Only read if curious, can be skipped).
Read 8 tweets
Lazarus Long Profile picture
May 9
@Alexander_Tin @DrJudyStone @MeganMolteni

Questions.

The FDA - monitoring people for 10 days. Which means calling them every day to see how they are. From the APHIS plan 👇.

But, per the Head of the FDA, the CDC is in charge of the workers' health?

aphis.usda.gov/sites/default/…


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Anyway, they are monitoring for 10 days. But incubation in poultry is 14 days, @DrEricDing.

@HelenBranswell crazy bird flu, right?



They don't know what it is in cows, per them, but they are going to drop it to 10 days because ?

statnews.com/2024/05/09/bir…
aphis.usda.gov/sites/default/…

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(Thank you to @Alexander_Tin for his fantastic notes.)

Back on May 1st, Demetre shared there were 100 people being monitored.

But, in the above article, Colorado has 70 by itself. That was April 26.
tinalexander.github.io/notes/2024/05
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Read 13 tweets

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