Hey Chadsvb,
Im running a 120mm computer fan at 9V,not sure of the CFM...but I have 2 home made carbon scrubbers attached to it,both intake and exhaust side of it. It seems to work fine and still does the necessary venting.

I have only about 3 23Watt bulbs in about 8 ft sq space and the vent is only 20mins every hour. I also have an oscillating fan made from a pusher prop for an rc aeroplane and a mini motor. My temps stay around 80f, which is maybe a bit hot compared to optimal but growing fine.

Good luck drewdp, dont sweat it too much, in my limited experience this stuff grows easily.Peace