The top can be removed through a difficult procedure compared to removing the front. On the picture we see the two exhaust fans, preventing hot air from staying inside the system, heating up the components. The fan to the left is 120mm, and the other one is 140mm.
At the right side of the big 140mm fan, an optional 120/140mm fan can be installed. The 140mm fan can be removed as well, making it possible to install a 120x240mm radiator. Cooler Master has placed a dust filter on top, which is used with radiators where the fans would be blowing into the case, instead of out.
All expansion slots is tool-free, and can be removed by removing a single screw. The pre installed fans can be connected to a power supply with a Molex connector, or 3-pin connecter for the motherboard. The top fan only has a 3-pin connection though.
To reduce vibrations and noise, Cooler Master has fitted the CM 690 II Advanced case with 4 rubber feet for the power supply. The bundled dust filter can be installed here as well to prevent dust from getting into the power supply.