you might have trouble putting a fan on the side panel of your case but that depends on where it goes. There is no problem putting another fan on the CPU cooler so u have an intake and exhaust since the way the CPU cooler faces doesn't make the fan obstruct anything really, maybe just make it difficult to plug some connections in. If the side-panel fan is lower than the CPU and where the cooler goes then you should be find, my old mid-tower had that problem though since the opening was exactly where the CPU is and the cooler so i had to take out the side-panel fan. On my new full tower HAF 932 theres no problem because it so much higher, the 230mm fan end up covering everything below the CPU, basically the GPU area with like half of the fan covering half the CPU cooler but theres still more than enough width.