This formula/chart could be of help to you or for future reference: http://www.greenpassion.org/f45/what-size-vent-fan-do-i-need-intake-area-size-3704/
with this sort of wattage, do you think a bunch of ozone generators would be more worthwhile than using carbon filters? i would just use both anyway for the sake of it, but still curious if most of the work is done by the ozone generators though.