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Computer components are susceptible to
heat. The components operate at high speeds and in tight spaces. For
example, hard drives operate at 7200 rpm and can be located
centimeters from one another. This environment is conducive to heat
build-up, which is an enemy to the components. Every computer case
needs proper airflow for the components to perform at their optimal
levels. The design of the computer case should maximize airflow.
Usually, the power supply generates the majority of airflow. The fan on a power supply cools the power supply unit and other internal components of the system. The fan pulls the air in over internal components, motherboard, chip and modular cards, and exhausts (pushes) hot air out the back of the computer case. This is typically the case with the newer ATX form factors. With the older AT systems, the fan pulls air from the outside and blows it directly over the motherboard components. Today, most processors have a fan attached to the chip. The onboard fan cools the CPU. Verify that the fans are working by listening for the fan. The fan should quietly run in the background. It should not make any loud or excessive noises. The computer case plays an important role in cooling the
internal components and is designed with cooling features.
Computer cases have air intake vents, which are usually cut into
the sides or front of the cases. In the back of the case is
located an air output vent, which is the exit point of airflow.
Air enters the front of the case (pulled by the system fan located
at the front), flows across the components, and exits the back of
the case as hot air (the power supply fan helps the air
circulation). Figures
It is important to keep the air vents clean of any debris. These vents will attract a considerable amount of dirt and dust. Airflow can be prohibited if the vent is covered with dirt and dust. The air vents should be cleaned frequently to ensure unrestricted airflow. A vacuum or a damp cloth can be used to clean the vents. Use only a vacuum specially certified for computer cleaning. Additional cooling fans can be added for computers that are used for long periods of time or are located in warmer environments. Computer systems that run cooler will last longer and perform better. Adding additional cooling fans is an example of proactive management. Proactive management involves a technician looking for potential problems before they become a serious issue. It is a way to help reduce computer problems. Generally, computer problems can be minimized if a technician is proactive. |
and 
show the airflow through a typical computer.