tiny voices :
I wouldn;t even bother. No need for a side panel fan.
I think I do, but you might no think so. Here's my setup.
I have 2 intake fans, one at the top feeding the CPU cooler and one on the front side of the case feeding to the hard drives.
I also have an exhaust fan next to the I/O shield.
Problem is I have no fans blowing air over the GPU, which is a R9 280 and it gets pretty hot in here, both in the case and the room.