ok well dont know where you wud have herd that ask any respectible hydro shop and they will say bigger for out take. aint my first grow and i have friends in the hydro buisness with 20 years expirence with 1 ov the best and most respectible shops for kit and advice. check my grow m8 ne box for a room got a full grow set up with sum ov the best kit on the market(indoor grow. ak 48 from nirvana), just tryen ta help a first timer but as per usual the first timer knows best as i thougth a did when i first startd.
I'm not saying i know best by any means, you may be mis-guided. There will be no fan on my intake bringing air in, it will just be a hole with ducting running in. Every forum i read is saying for a Passive intake/Active exhaust you want the intake to be slightly bigger than your exhaust. I'm not saying i know more, i know the learning process is endless and i am just starting. But when everyone else is saying the opposite of you, i think i will go with majority.