@Capt C I forget what thread you were talking about single pass ratings, here's the spec of my new filter I thought you'd be interested in.
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In a recirculation mode it's rated for almost 1700 cfm. But single pass it's only rated for 840.
I've got it running about 500 cfm off an 8" max fan on #2 speed. Has solved my rising RH issues. Lol.
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It's a big ass filter fo sho. Picked it up brand new for $40 last weekend. It's easily refillable whenever the time comes.
Lol, it's got about 60# of carbon in it so it shouldn't need a recharge for at least a year or two in theory.
It's about the size of 3 five gal buckets stacked.