Active intake grow tent questions

[Doubledealing72]

Hey all! I have a question about my grow tent and circulation. I understand the setup with the carbon filter and fan for the exhaust, but I was curious about how putting air back in goes. My grow tent has small flaps in the bottom, and when you remove these there is a black screen under the flap. Do I just put a normal fan by that screen and leave the flap off of it? Or should I use a different ducting port (my grow tent has at least 3 or 4 different ports for ducting to go through)? Are the flaps on the bottom made specifically for this purpose?

Thanks!

[DrPhoton]

The screen ports are for passive intake when using a exhaust. Active intakes are not required if you have a sufficient exhaust system that can pull air in passively with negative pressure
Active intakes can be used with one of the other available intakes that have a fastener.

[Doubledealing72]

Thanks Dan! After posting this, I stumbled on an article on gwe that also explained this. Appreciate your input!