The side panel comes with a pre-modified intake hole. In total, there are three exhaust and intake holes. One located on the bottom front, another under the PSU, and the last one on the side panel.
The intake on the side panel is a bit different. Most times, you would just install an 80mm fan and call it a day. The PC613XX offers something a bit extra, a cooling duct.
Depending on how far away your CPU/HSF is, you can adjust your cooling duct accordingly by pulling or pushing it.
The rear is common fare, nothing too special. The power supply is not included, so please keep this in mind if you plan on purchasing this case. Another unique feature is the expansion cards locking bracket. It uses the side panel to hold itself in. This eliminates the need to find your screw driver and screws.