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“Better Air Purifiers” by jefftk
Are you looking for a project where you could substantially improve
indoor air quality, with benefits both to general health and reducing
pandemic risk?
I've written
a bunch
about
air
purifiers
over the past few years, and its frustrating how bad commercial
market is.
The most glaring problem is the widespread use of HEPA filters. These
are very effective filters that, unavoidably, offer significant
resistance to air flow. HEPA is a great option for filtering air in
single pass, such as with an outdoor air intake or a biosafety
cabinet, but it's the wrong set of tradeoffs for cleaning the air
that's already in the room. Air passing through a HEPA filter removes
99.97% of particles, but then it's mixed back in with the rest of the
room air. If you can instead remove 99% of particles from 2% more
air, or 90% from 15% more [...]
---
First published:
May 11th, 2025
Source:
https://www.lesswrong.com/posts/bBX46cBpbruv2kJh5/better-air-purifiers
---
Narrated by TYPE III AUDIO.
---
Images from the article:
Apple Podcasts and Spotify do not show images in the episode description. Try Pocket Casts, or another podcast app.
View all episodes
By LessWrongAre you looking for a project where you could substantially improve
indoor air quality, with benefits both to general health and reducing
pandemic risk?
I've written
a bunch
about
air
purifiers
over the past few years, and its frustrating how bad commercial
market is.
The most glaring problem is the widespread use of HEPA filters. These
are very effective filters that, unavoidably, offer significant
resistance to air flow. HEPA is a great option for filtering air in
single pass, such as with an outdoor air intake or a biosafety
cabinet, but it's the wrong set of tradeoffs for cleaning the air
that's already in the room. Air passing through a HEPA filter removes
99.97% of particles, but then it's mixed back in with the rest of the
room air. If you can instead remove 99% of particles from 2% more
air, or 90% from 15% more [...]
---
First published:
May 11th, 2025
Source:
https://www.lesswrong.com/posts/bBX46cBpbruv2kJh5/better-air-purifiers
---
Narrated by TYPE III AUDIO.
---
Images from the article:
Apple Podcasts and Spotify do not show images in the episode description. Try Pocket Casts, or another podcast app.
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