Very effective air filters can be built for under $100
by 88_92WSND (2024-01-02 14:39:29)

In reply to: Ventilation is not really an option  posted by DBCooper

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which can reduce exposure by around 80% if used alone, and up to 90% when used in concert with masks. While not the perfect solution, if the other choice is crappy air turn over in an old poorly ventilated building where renovation is impossible, impracticable, or unaffordable, CR boxes have been shown to work.



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