One of the biggest problems for any computer is unwanted heat. Heat generates resistance, which prevents electrical signals from getting to their destination intact. This, in turn, causes errors and ultimately shortens the lifespan of the system.
Take a look at your motherboard, and you’ll notice several heatsinks. The most conspicuous of these will be over the Central Processing Unit. Heat travels from the top of the CPU and is dispersed into the metal fins. From there, a fan blows the heat away. While the details may vary in the case of a water-cooled system, the principle remains the same: being able to distribute heat is critical to any computer’s long-term prosperity. Consequently, you’ll find plenty of fans positioned around the case to draw air in through one side of the machine and out of the other.