Optimal CFM for a 2' X 2' X 3' Veg box

I will be running my veg under CFL's in a 2x2x3 box. going to get a couple of muffin fans for intake and exaust (with DIY carbon filter) so what do you think the most CFM I will need for this setup?
I am also going to use this box for clones, so I don't want to worry about wind burn. I know a mere 12CFM fan will exaust the box once evry minute, is this enough? or should I go higher, I am looking at fans as high as 130CFM.

I would go bigger you can always turn it down

I would go bigger you can always turn it down

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Yep, that is what I was thinking, besides I found a really great deal on some 130 CFM muffin fans ($8.00!). I'm not sure about turning them down as I will be wireing the fans directly to an AC adapter, but no big deal. This is one big learning process, I will understand all this stuff eventully

130 CFM is plenty