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Kris

@pezmico @dean @libroraptor

youtu.be/QSnUce9xdNo

Naomi Wu is a Cantonese Maker who has covered this extensively in a series of very thorough videos. How it works, how it is safely done and how to install, how to do it cheaply.

You want a very specific kind of UV light source, 222 nm, twitter.com/realsexycyborg/sta, and install it in air ducts or filters to deactivate virus material,

5 May 2023 at 0:49 | Wall-to-wall | Open on chaos.social
3 comments
Alistair K

@isotopp @pezmico @dean For the school contexts that I'm thinking about, home-made won't do – it'd have to be a commercially supplied one from the HVAC company. These things have been around for years; what I'm wondering is whether there is an important reason why they're not being promoted while filtration is.

5 May 2023 at 1:12 | Open on mastodon.nz
Mike M.

@libroraptor @isotopp @pezmico @dean
I get the impression that inside the HVAC ducts, UV is expensive and not super effective, bc air circulates through quicker than viruses get destroyed. You can add more UV lighting inside the ducts, but that gets even more expensive (and adds maintenance and safety issues -- UV shining out of grates, etc.). So high-quality mechanical filtration tends to be more effective. (But UV may be good for reassuring ppl.)

5 May 2023 at 9:13 | Open on mastodon.world
Alistair K

@mmlvx @isotopp @pezmico @dean I didn't think to check Wikipedia before, but it turns out that they have a broad-and-thin, inconclusive, but at least reasonably current, summary en.wikipedia.org/wiki/Ultravio

6 May 2023 at 0:25 | Open on mastodon.nz
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