I would disagree with you on that @PurvaidaC... the intake should always be smaller than the exhaust, and all of the books teaching you to grow inside also say the same thing. Because you want the exhaust to pull air from any air leaks you have thus putting your area under negative air pressure, so you hear the suction of air entering into the room or growing area if you get a leak. If on the other hand someone were to have an equal sized intake or bigger intake than exhaust you would put those air leaks in your growing area under pressure, so the smell inside of the growing area would be being pushed out without it being filtered by the carbon filter, and if that's the case, why even have a carbon filter? Because you don't want the smell getting outside the area, you want air being pulled in any air leaks, to ensure no smell ever gets out... EVER. It is also much easier to seal a room that is under negative air pressure than it is to try to seal an environment under positive air pressure.