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A comment on Real-world data show that filters clean Covid-causing virus from air. Parent comment

Re:Real-world data show that filters clean Covid-causing vir... by bradknowles on Monday October 11, 2021 @12:15AM (#28824604)
They don’t allow s-traps or u-traps in new US construction, either. I believe that it’s p-traps only.

Hopefully this will help.

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