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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
Jul 22
🔥 Wildfire season, folks! 🔥

Got a smoky or smokey house from a fire or a BLT sandwich gone wrong?

TLDR;
Make a #CorsiRosenthalBox with activated carbon filters

AND CLEAN SURFACES:
By vacuuming, dusting; then wiping and mopping with a commercial, non-bleach solution. Pic of smoke and fire - hopefully not headed your way.
Huge caveat. The carbon filters will fill up quickly with particulate matter.

While the smoke is ongoing? Regular filters.

After the smoke is over, while cleaning up? The activated carbon filters (ACF).

Someone is working on a variation of the CR Box w/ 3 regular panels,
1 ACF panel. Numbers are still being run. No ETA, so I am going forward with this thread, as is.

⚠️ACFs are also great for paint fumes.⚠️

BTW, this thread will get a fair amount of useful clarifications, so check the end of the thread, in a couple of days.
Read 21 tweets
Lazarus Long Profile picture
Jul 22
A new strategy.

I used this new study, that points to C0vid co-infection with StaphA, worsening StaphA, to write the HICPAC.

The patient safety pages do not recommend N95s.

This allows me to avoid the quarrel of StaphA OR C0vid being airborne.

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And allows me to use their words on N95s being best for C0vid against them.

Soft-copy email below.

hicpac @ - just join these together.

This strategy can be used on every safety page for every disease.

cdc.gov
docs.google.com/document/d/12y…


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- SARS-COV-2
hastens
worsens
X

Find the X CDC safety page. Confirm no N95s recommended. They never are.

And you are off to the races.

Some will think, "this is just some weird internet trick."

This is just us using their system against them.Scholar.google.com
Read 4 tweets
Lazarus Long Profile picture
Jul 19
A NEW Colorado Chicken farm outbreak with 1.34 million.

The one with 5 people confirmed infected, 64 pending, has 1.8 million, 10-14 days of work.

CDC team of 10 has just been dispatched for the 1.8 million.

The farms are about 35 minutes apart (thank you @0bFuSc8!)

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Read 5 tweets
Lazarus Long Profile picture
Jul 16
Holy airborne H5N1.

69 symptomatic workers, 5 positive so far?

150 on antivirals?
It's always been airborne.

This means that it is more transmissible to the humans than before.

Not Covid levels. Probably not even original WT level.

But more transmissible to the humans than before.
Homeland Security moved to Level 2.

Read 8 tweets
Lazarus Long Profile picture
Jul 16
I get it. You need a place to decompress.

So, the Covid Careful tend to take umbrage to outdoor transmission studies.

Outdoors IS safer. But study after study has shown outdoor transmission.

As do these 2 studies.

Catching Covid Camping.

🧵.

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I deliberately began this thread with white men, because the only countries doing these detailed studies are Asian countries. As is this one.

But every time, a tinge of ethnocentrism creeps into replies. Please keep this in mind :) .
Many don't know that measles is airborne outdoors based on an hour long conversation with a young boy and his family, after the Special Olympics. No CCTV. No credit card tracing. No GPS.

Our first study? July 24–26, 2020. South Korea. South Korea had done an
Read 20 tweets
Lazarus Long Profile picture
Jul 15
Great summary below. Some important info not discussed by Dr. Hirschson.

This study adds to RECONFIRMING H5N1 is airborne.

Since seeing is believing, you are one of the VERY FIRST to see what H5N1 aerosols do to a cow lung.

🧵
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This study is by the USDA.

As I have, & will continue to point out, @nirav_uscdc, they continue to ensure dairy workers are NOT told to wear N95s. Or PAPR as indicated would be more comfortable by @RanuDhillon @sri_srikrishna.

But worn here in their lab. By them.
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Aerosols, 3-5 microns, were nebulized into the cows nostrils.

Correction to the study...SOME of those that size will deposit into the Lower Respiratory Tract. Not all. Some will deposit into the Upper Respiratory Tract.

Some will be exhaled, and inhaled again.
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Read 27 tweets

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