Fwd: [PNA_Fixers] DIY home HEPA air filter: the Corsi-Rosenthal Box

[Bill Levering]

Begin forwarded message:

From: Michael Kucher <mku...@gmail.com>

Subject: [PNA_Fixers] DIY home HEPA air filter: the Corsi-Rosenthal Box

Date: August 10, 2026 at 9:39:12 AM PDT

To: "pna-f...@googlegroups.com" <pna-f...@googlegroups.com>

Reply-To: pna-f...@googlegroups.com

Someone brought a fan and a filter to help them mitigate wildfire smoke at home last Wednesday, which made me think of the Corsi-Rosenthal Box invented during the pandemic to intercept airborne virus particles.  I could not recall the name of this gadget at the time.

If the smoke returns, here is any link that allows anyone who can apply tape to a box to build this simple, effective, and relatively inexpensive device.  Could also be useful for flu season.

I suspect everyone on this list has seen at least a picture of one, but I wanted to provide some links that we can pass on to our clients (is that the word?).

https://cleanaircrew.org/box-fan-filters/ 

https://corsirosenthalfoundation.org/

--

Michael

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