Damon Binder recently wrote up an argument for prioritizing air filtration over far-UVC for pathogen control:

UVC and filtration are close substitutes—both deliver effective air changes per hour, both reduce airborne pathogen concentrations by the same amount per eACH—and on current pricing, filtration is cheaper.

There's a lot of good stuff in his analysis, but I see [1] three considerations that really change the bottom line:

1. Cost is actually much lower.
2. Noise is a serious issue.
3. Performance is dramatically higher in larger rooms.

Cost is straightforward. Binder priced far-UVC based on the high-quality Care222 lamp with the Krypton-11 at $2,500, but there's a much cheaper option, the Aerolamp at $500. It's also moderately higher output.

Binder analyzes a 30m2 room with a 2.5m ceiling. I'll assume this means 6x5x2.5. If I configure Illuminate with an Aerolamp in one corner pointed 0.5m above the far corner the installation is within TLVs and I get a median effective number of hourly air changes (eACH) of 11.6. The lamp degrades approximately linearly over Binder's 11,000 hour evaluation period down to 70% capacity, so we're averaging an eACH of 9.8. Over that time you're paying $500 for the [...]

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Linkpost URL:
https://www.jefftk.com/p/contra-binder-on-far-uvc-and-filtration

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Narrated by TYPE III AUDIO.

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