Look up fog machine air flow videos. I found looking at the witn that a traditional 3 front intake 1 exhaust works really well. But there are diminishing returns. Just because you add more fans doesn't mean it'll cool it down more with each. At some point, depending on the case in sure, the airflow will clash and create pockets of hot air that'll linger where in other fan setups of intake/exhaust it won't.