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
ConanTroutman Reviewed by ConanTroutman on . CFL heat question Hi all. I'm working out the details for a rubbermaid grow setup that is going to be 7.39 sq. feet. It's going to have 2 passive intake holes about 1 1/2 inches wide on one side, and 2 computer fans hooked up on the other side for active exhaust. I want to put 8 40 watt CFL's in it for a total of 21200 lumens. My question is, am I going to have a major heat problem with this much lighting and this small of an exhaust? I don't want it to get over 85 degrees and I would prefer not to burn Rating: 5