i want to gro sum killa chronic but need help the underground rm setup i have a 17m x8m x 8m i want to do the whole rm s.o.g with sum heavy yielding strains.. ive have studied jorge c. bible and think im ready for my first grow but i still dnt entierly get how to make a good enviorments for my babies lke how too set up an underground ac and how will the air escape so new air we be rotating i now about the fans but i mean the air has too get out of rm the rite (underground)? pls help