I'm sure that the filter with fan that came with the cabinet work okay. I'm to lazy to do maths to grow a plant. Lol!
It's not air refreshment I'm looking for. I just feel like there should be a bit of movement of leaves and branches. Before I started I read as much info I could find. Then I internalize that info and let instinct and logic in the mix. One of the "gut-feelings" I keep having after my first grow, is that I need to get the lady to think the bud sites are catching a breeze, so that she starts pumping them up to catch pollen that are transported by the wind.
I like gut-feelings. They serve me well.