What does Case fan mean?

Case fan meaning in Computer Science Dictionary

Alternatively called something fan, an instance fan is an admirer positioned inside some type of computer situation attached to the front or straight back of this computer system that helps bring air in to the situation also just take heat out of the case. Computer instance followers can be found in a wide variety of sizes, however, 80mm, 92mm, and 120mm (12cm) with a width of 25mm would be the most often used situation fans in a computer. Here is a graphic exemplory case of just what a computer situation fan may look like.