There are a variety of fan measurements that could be put inside a case. You can also find many different different types of followers which will go inside of a computer. If your computer followers end performing, then you must find out what size and type of supporters your computer https://www.google.com/maps/d/edit?mid=1dqA98Lvl4GVumjN4tbfbVORP3YfbEWU&usp=sharing