hey I'm building a PC it's not my first build but it is the first time I've messed with fans I never really gave them much thought. my PC isn't finished yet I still need the CPU I am getting an A6-5400k and until I can afford a new case I will be using the OEM cooler. Will a 80mm exhaust fan that pushes 33.5cfm be good? I have a 120mm front fan as well I'm not sure of the CFM on that one but I'm not sure how long that one will stay there due to it not fitting properly