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Air flow is an interesting subject and results vary from one case to another. Any fan mounted in the rear OR above the mid line of the case should exhaust air from the case (blow out). Any fan mounted in the front or below the mid line should intake air to the case (blow in). However, you never want more intake volume than exhaust since that will cause a pressure build up inside the case and prevent the proper evacuation of the heated air inside. My suggestion would be a trial and error experiment. Start with the side fan disconnected. Make sure you have plenty of rear exhaust and unobstructed intake. You can enhance the intake with an additonal fan but it may not be necessary. Check your case temps and cpu temps and keep track of the effects the changes make. Once you have a stable case temp, try running the side fan as an additional exhaust and see what effect that has on the temps. Then reverse that side fan and make it blow in. See if the temps go up or down. I don't believe anyone is going to give you the definitive answer on which way is best. You'll be better off experimenting.
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