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Jeff Kaufman 🔸

Co-Lead (Near-Term Detection) @ Nucleic Acid Observatory
16969 karmaJoined Working (15+ years)Somerville, MA, USA
www.jefftk.com

Bio

Participation
4

Boston-based, NAO Co-Lead, GWWC board member, parent, musician. Switched from earning to give to direct work in pandemic mitigation. Married to Julia Wise. Speaking for myself unless I say otherwise. Full list of EA posts: jefftk.com/news/ea 

Comments
1031

Better Air Purifiers
Jeff Kaufman 🔸2
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Interesting! I hadn't realized people had started using the term this way!

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Better Air Purifiers
Jeff Kaufman 🔸2
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That's a box fan CR box

A filter with PC fans isn't a "CR box" -- a Corsi-Rosenthal box is specifically a design based on box fans. For example, Wikipedia, US Davis, Clean Air Crew, and the Corsi-Rosenthal Foundation mention only box fans.

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Better Air Purifiers
Jeff Kaufman 🔸2
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Good point! I'm used to houses with the older systems (steam, forced hot water) that are common in the Northeast and wasn't thinking about this effect.

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Better Air Purifiers
Jeff Kaufman 🔸4
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Efficiency in terms of fraction of removed particles wouldn't decrease, but because CFM will decrease efficiency in terms of CADR will too.

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Better Air Purifiers
Jeff Kaufman 🔸2
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Ceiling fans are generally reversible, so you could have the ceiling fan blowing air up and mount the filters for airflow in the opposite direction. I haven't tested this configuration though!

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Better Air Purifiers
Jeff Kaufman 🔸6
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There is actually this study from the national labs that indicate filters hardly need replacement at all. I think it is even worse than razorblades that grow dull - filters last forever!

That study is looking at nuclear facilities, but I'm not sure it generalizes to environments with more particulates in the air. In a dusty enough environment your filter will surely get clogged up to the point where you're not able to move much air through it!

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Better Air Purifiers
Jeff Kaufman 🔸10
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I do have my question about your design (and GPT o4-mini-high is pretty skeptical), wondering whether the fan really draws all the air through the filters.

When I tested the prototype it worked well: https://www.jefftk.com/p/ceiling-air-purifier

Now that I know more about how these fans move air, I think it would work even better if the filters extended slightly lower.

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Reflections on 7 years building the EA Forum — and moving on
Jeff Kaufman 🔸8
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We all really appreciate the work you've done for the Forum over these seven years!

Let me show you what the Forum 1.0 looked like seven years ago. ... It didn’t work on mobile

And now time for quibbles! The mobile implementation was a bit of a hack, and there were occasional elements that were way the wrong size, but it did work! (#65, initial effort). You can play with the archive; here's the old Forum on 2017-02-12.

The new one is of course way better ;)

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