Hi all. Well, after reading hours on these forums, i've decided to build my own grow box. My only problem is figuring out how big my fan exhaust fan needs to be. I also plan on building a diy scrubber for this exhaust. My grow cab is approx. 27" high, 14" wide, 12" deep. Any help would be appreciated. Also, if i have a passive intake, won't odor leak from this opening in the box? Again, your expertise is sought.