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As stated there are meshes everywhere. You'll notice that the Obsidian 250 has 2 expansion slots allowing you to go for a nice dedicated graphics card as well. You can install graphics that are up-to 29cm in length and they can be up-to dual-slot wide. So even the toughest graphics cards of the moment can be installed.
The top side has a see-through panel that will expose your cute and tiny mini-ITX board. The Obsidian Series 250D is supplied with 2 fans as standard, one 140mm intake fan and one 120mm exhaust fan. A total of 5 fans can be installed. The interior is arranged so that the included 140mm front intake fan draws cool air directly over your GPU. All-in-one-coolers such as the Hydro Series up-to 240mm will be supported. Alternatively you could also install a 120 mm / 140 mm radiator on the front.
You'll notice that in the top front the power button with HDD LED activity (to the left),To the right a 3.5mm headphone and microphone jacks, in blue two USB 3.0 ports.
Now if you push at the top of that front door, it'll unlock ....
You can now access the removable dust filter, or if that's out the fan located behind it. Two fans are included with the case (140 mm / 120 mm).