Help with filter and 2-way fan setup

Ok, guys. So I bought a grow tent kit and have gotten it almost completely set up…but I’m confused on the 2 way fan and carbon filter set-up. Website lists like 3 different setups and now I’m confused. Initially, I had filter inside tent, connected by ducting to 2 way fan “in” side and had the fan blowing “out” side blowing out of the tent. Then I saw a set-up with filter outside tent pulling in air and fan output side blowing inside tent. At this point I think I’m overthinking it and have gotten myself confused. I know with greenhouses the fan always blows air out…but confused on what my plants need. I’m planning on growing 2 plants from seed in the tents. At this point my seeds haven’t even germinated yet, so I need to figure this out before the sprout! Thank you in advance for educating me, I’ve never grown indoors before and want to make sure I get it right!

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