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A comment on Experiments on a $50 DIY air purifier (2020). Parent comment

Re:Experiments on a $50 DIY air purifier (2020) by sokoloff on Thursday September 02, 2021 @02:33PM (#28395633)
> Both filters are on the intake side of the box fan. This means you don't need a bungee cord because the intake has negative pressure, the filters just "stick"

I agree with putting them on the intake side, but I still want them to stay put when the fan is turned off (with the switch or to move it to another outlet or in a power outage).

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Re:Experiments on a $50 DIY air purifier (2020) by matmann2001 on Thursday September 02, 2021 @06:03PM (#28397951)
There are large rubber bands you can buy specifically to hold the filter in place on the box fan. I've seen them on Amazon.
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