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.
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…
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).
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…
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
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…
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
good performance.
I AM impressed!
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