Sealed or vented.

Hey guys, first time grow here in veg, just started wondering if i should do
a sealed grow in my flower room or just intake exhaust.
My room is already completely sealed with an exhaust running through might lights too cool them
all i would have too do is put the end of it in my veg room where my intake currently is.
Was looking at some c02 systems, real short on cash found this though,http://www.amazon.com/Hydrofarm-System-cubic-Timer-COSYS20/dp/B0002HFNIA
was wondering if this would doo the trick on a completely sealed room at 8ft by 5ft 8 ft tall with 2000 watts raptor 8, let me know what your guys opinion on a sealed grow is.
also i live in Michigan and growing in garage if its humid outside its humid in my room and so on
thanks.
FOR more info on my setup heres this
https://www.rollitup.org/t/first-post-ever-co2-sealed-too-solve-problems-or-no-plus-other-questions.833318/#post-10599821

i sealed mine hepa intake and exzost every hour 5 min.. no lens more lumens more wieght no cleaning the freeking glass co2 and the intake keeps fresh air its the best in my opionion..

Done both. Sealed is a larger startup investment that pays for itself in short order if running CO2.

Electricity is a drop in the bucket compared to the value of an added 20 - 30% yields.

Stealth is also enhanced with sealed.