I need help figuring out what kind of exhaust fans to run. I have a 20x7x11 room so I need close to 300 CFM for my grow space. I was wondering if anyone had any suggestions as to any exhaust fans that run very QUIET and close to 300 CFM or sufficient enough for my grow area? I plan on running 2 1000w HPS's in my flowering space and 1 MH possibly in the other area and was also wondering if my single 8" vortex inline fan w/ ducting would be sufficient enough to vent all 3? Thanks.