Quote Originally Posted by melodious fellow
He said he had an "intake fan" That is an active intake.

He did not mention having any type of active exhaust.

Active intake + passive/no exhaust = positive pressure

Hopefully he will get an active exhaust for this next grow.
Yeah.. I kinda just posted that so that when he eventually switches his current fan to become an exhaust he can obtain maximum airflow with it. He obviously got the wrong idea on his first go, so I was just clarifying/outlining basic concepts of moving air.