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I've been keeping an eye on the so-called Corsi-Rosenthal box. I'm probably going to build one or more at some point.

There's a bunch of folks that have been optimizing this design on Twitter. The initial results look quite good and properly put together might last an entire school year.

Link here: https://www.texairfilters.com/iaq-research-practice-in-actio...

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It is amusing how this person has the temerity to name this configuration (partially) after themselves, while people have been making and documenting these configurations for at least a decade and surely longer.

You could also go with smaller filters, like 14x20 to reduce the stack size, but the prices don’t scale exactly with surface area, while the pressure does. So I’m not sure how much that really buys you.

IIRC, increased surface area reduces pressure. From what I remember from reading the thread, it appeared to have pretty decent CFM through the use of more and larger filters.

EDIT: I found the thread. See https://twitter.com/davidelfstrom/status/1429526273009889286...

Thread shows the difference between using 1 and 2 filters. I think he has a separate thread in his Twitter feed measuring a 4/5 filter setup too.

Increased surface area alone results in higher pressure losses / flow energy losses due to increased frictional losses from the higher surface area.

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