Ok so I bought a fan its rated at 180 cfm my cabinet is 72 inches high 36 inches wide and 20 inches deep I have the fan on the bottom of the cabinets with a shelf over it and a hole cut in the shelf blowing up into the grow space I have another shelf on top with a hole and its exhausted out the back of the cab..... idk if maybe I have more then 180 cfm in my cabinet or what but my cabinet with both my 125 cfls is getting up to 88 degrees farenheit I was using to cheap 4 inch desk fans and it was doing better then this plz let me know what I can do thx the fan I have is a 4 inch inline fan I got from a local indoor garden store