The case: To give you, the reader, an impression of the CM 690 II Advanced case size, I've placed a 3.5" hard drive next to it. It's worth mentioning that the case supports 2x 80/92/120 or 140mm fans in the side panel, ensuring effective cooling of the system. There's no dust filter there though, so the fans might suck in some "dirty" air.
On the opposite side of CM 690 II Advanced, a 80mm fan can be installed to cool the area around the processor. Both side panels can be removed by removing two screws. CM has used Thumb screws for this, meaning that no tools is required to remove them.