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if you cut holes in your box or figure a way to get the computer fan to be an airtight seal....and have one on the top above the lights like you said
and one on the bottom bringing in fresh air. you want 2 fans the same size rated to move(measured in CFM-you probably knew) around 2 times the size of your grow box...so about 50 CFM?
and you can actually even get like a 100 CFM fan and build a carbon scrubber(filter) for your grow for the exhaust fan only obviously.--i can get the link to build one if you need it.
You could always buy a 60 dollar inline fan and fix the problem all in one go.
and have a little fan on low setting to blow the little plants a little.
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