If you caulk all the seams, like where wall meets ceiling, wall meets floor, completely cover and seal windows... I don't know why it wouldn't be possible, if you're careful, to create a situation where no air gets outside. Not easy, but possible. There is such a thing as a closed grow environment. Can you create one in an apartment? Why not, if you give enough attention to where air would get out. 12 lights seems like way over the top, though. Where would your intake and exhaust be, how would you keep smell from getting out there?
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