I need help figuring out what kind of exhaust fans to run. I have a 20x7x11 room so I need about 500 CFM for my grow space, correct me if im wrong. I plan on running 2 1000w HPS's in my flowering space and 1 MH and a 4ft 8 bulb t5 hood in the veg space and would be venting out just above the grow area. Ill also be running 8" vortex inline fan(747cfm) w/ ducting to cool the lights/hoods however often is needed. I'm wondering what kind of exhaust fan should I get that would run quietly and at sufficient enough cfm to vent the given area in addition to the vortex inline? Thanks.