There are 8 expansion slots, with the 8th one making installing double-slot graphics cards on the last expansion slot easy. Each slot cover has a vent with dust-filters. Dust filters also make it to other areas such as the PSU air intake and the front grill.
The case has vents on almost every side. Fans include one 120 mm front, a rear 120 mm, a top 120 mm fan (while the top has slot for two 120 mm fans), a large 220 mm fan on the side-panel, which also has holders for four 120 mm fans instead of the 220 mm fan. Some panels also come with noise-dampening foam padding. Right below the expansion slots and above the PSU, there are four holes for water-cooling tubings, for two independent loops. The front-panel is located on the top, and has FP audio, two USB ports, two eSATA, and an IEEE-1394a.
Source: TechPowerUp