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Re:A paradigm shift to combat indoor respiratory infection by infogulch on Friday May 14, 2021 @04:49PM (#27159526)
> "countercurrent heat exchangers"

Very interesting! The concept makes a lot of sense, and I was able to find some companies online that produce such a thing, often under the phrase "counterflow heat exchanger".

Frustratingly there's little details online for actual pricing, but you can find the bare exchange units on ebay for $200-300.

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