I know that i read somewhere about stacking case fans for improved air flow. this is my take on the idea. I know the CFM for 3 of the fans and the PSI for only 1 of them the top one is 38.6 CFM .16 PSI. 2 of the side fans (the ones with the grills are 35.64 cfm. i have each fan separated from each other with cardboard and hot glue on everyside except the direction i want the air to flow. i want to know if you guys think that this improves performance.