My tent is 0.6 x 1.2 x 1.8.
I can grow 4 medium plants fine. I have done 6 but it is a push and crowded plants do not yield as well.
I run a 6" out and 4" in. So that is a 6" carbon filter. You could get away with a 4" in my tent, but bigger is quieter as you can run a lower speed setting.
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