Enough exhaust?

I'm building a grow cabinet with the following dimensions:

18" deep x 35" wide x 44" tall

I'm looking to buy exhaust fans right now. Would a 120mm 70CFM computer case fan be enough to properly move air out? I'd be using a passive intake with it, unless it'd be a better idea to get an identical case fan and use it as an intake.

Thanks in advance!

I would think a 70cfm computer fan for intake and another 70cfm for exhaust would be perfect for the space.

Ya man you only have 16 cubic feet that means you will exchange air more often than every 15 seconds.......I would call that more than adequate.

-OitW