Intake and exhaust - ventilation.

From what I've heard, passive intake should be 2 times the diameter of exhaust fan for the air to flow freely.
Not sure if it's the fact, but..

What if I don't want to make such big hole for the intake and I want to install an intake fan instead? Does it have to be as powerful as exhaust fan? If intake fan would be running 2 times slower/weaker than exhaust fan, is it going to block the airflow or is it going to blow faster thanks to exhaust fan running?

fucking the intake can be the same size as the exhaust and the holes can be the same size as your fan . no need to make them bigger i have a few to many tokes of these cherry tomatoes going right now hard to think if you knowwhat i am saying .