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Nice setup.
I took a look at your journal and saw you have the lights cooled so we are talking about the environment and I understand you want to keep approx 1400 ppm CO2 in there.
What I found in regards to intakes is if the hole is large enough I didn't need an intake fan. Like you I went into the sub floor (4"x12" hole) and out the top. I have dual cabinets so only about 10 sq feet or so but with only one 80 CFM bathroom fan and passive intake the cab stays 5 to 10° below outdoor temps. (light is in diy cool tube 110 CFM fan) so not much heat.
On the other hand using CO2 I am sure when you want to exhaust you want to do it as quick as possible and by matching the CFM to the exhaust in a 9x9 room it would happen almost instantly. with 9 foot ceiling you got like 729 cu ft right?
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