How Many Case Fans Do I Need?

Many people are unaware of how many case fans do I need that most computers die because of excessive heating. The internal hardware of a computer will finally fail to function if the gadget gets heated up very much.

However, cooling the pc is the only way of carping the heat, and increasing its lifetime. Below are some strategies to help keep your computer cool.

Hopefully, you have noted more than once that your computer contains fans in it. The fan’s primary function is cooling the personal computer.

Computer fans function by attracting cold air from outside the computer as it expels the warm and heated air in the device hence cooling it.

The cold air is moved across the heat sink to get the specific component of the computer cooler. Usually, a computer fan is inbuilt, or in case active cooling is needed, the fan may be attached to the computer micro ATX case.

Exactly How many case fans do I need?

The cases differ, and the number of cases that you can use on your computer depends on the type of the case.

Despite the compact cases being lighter and hence easier to port, they only contain a spot for a single fan, which considerably limits your cooling selections.

However, as you will find out, most of the modern gaming towers will contain numerous options allowing the mounting of several fans.

Generally, gaming towers have intake and exhaust fans where the intake fans are situated either in the bottom or front of the case, whereas the exhaust fans are situated on the rear side.

Interestingly the direction of the fans is the primary determiner of whether the fan will act as an exhaust or intake type of fan.

More intake fans are located on the side of your case while larger cases contain the option for additional fans at the top for further exhaust.

As mentioned earlier, the direction in which you install the fan determines if it becomes an intake or exhaust fan. What then can one expect if they installed two exhaust fans, two expel hot air from the computer?

If this is done, more air will be pushed out than the air being pushed inwards, and this will create negative pressure. The air expelled from the system must be replaced.

To eliminate the negative pressure from the system, you need both the fans -exhaust and intake. Remember hot air is lighter hence rises above.

Therefore, the cold air must flow from the bottom or front of the PC as warm air is made to escape through the top of the rare.

PC fan setup:

Below is the process on how to install a case fan:


Temperature monitoring software is an important program. The software helps measure the temperature at which the CPU is working.

Therefore, before installing a new case fan, browse, download and install the software. Run the temperature monitoring software in the pc, the software will help determine whether the new case fan makes a difference.


Switch off the computer and unplug the power source


Detach the case’s side cover, this will give a chance to view the PC’s internals.


The new case fan is placed in a mount, join the four clasps that go into the edges of the mount. A considerable number of fan mounts possess a square or round area of work to permit airflow with screw gaps in the edges.

The installation area is selected carefully with the aim that the fan will either expel hot air out or draw in cool air.

Individuals are advised to add a fume case fan on the backboard in the upper portion of the case if it’s the first time to install the fan.

For a subsequent fan, an admission fan mounted close to the base of the front board will give progressively cool air to the segments.

Check the arrows on the casing, to know which bearing the fan is blowing.


A small plug is joined with the fan capacity connector to a header on the computer motherboard, and a big plug is fitted to an additional white Molex connector from the capacity supply.


Close the case, turn on the PC, and keep track of the temperature. A cooler CPU shows an effective installation, but if the heating persists: rehash the procedure but this time changing the case fan in a different area.

A speedy testing approach is reversing the case fan so that it blows the other way, the approach applies if the case fan was installed inappropriately in the first attempt.

For an easy and quick installation process watch here:

Case fan sizes:

Typically, case fans vary in size, and they exist in sizes of 360 mm case fan, 200mm, 140 mm, 120 mm, and 80 mm.

Many cases provide for the 1140 mm and 120 mm case fans. If you doubt the fan that suits your computer, you should measure it by yourself.

However, most users go for case fans of 120 mm. It is venerable to measure your former fan if you are replacing it.

Top case fans:


ARCTIC F8 PWM Rev. 2 is among the top case fans accessible in the market. A substantial number of people prefer the brand because it has a two-way installation that removes the hot air out and allows cool air into the case; enabling efficient pc cooling.

The Arctic F8 comes with a 4-pin connector implying that it is set to plug and play. The Arctic case fan has also fluid dynamic bearing, coordinated with a case of greasing up oil to guarantee that operation stays smooth and quiet even at peak speeds,

in addition, other calm models regularly depend on a sleeve bearing to accomplish this degree of calm, notwithstanding, the brand service is typically a lot shorter compared to fluid dynamic bearings.

[one_half] Pros:

  • Simple to install
  • Cheap
  • Produces minimal sound
  • Small in size[/one_half]


  • It cannot fit in a large case, due to the small size.
  • Not durable

Computer case airflow guide:

Adequate airflow in your case is critical since the fans only function by pushing air in one direction. Therefore, it is significant that you ensure they are placed accurately.

Some of the fans bear pointing arrows to indicate the direction of flow air once installed, otherwise, the air will flow through the sides where the spokes are located. Always counter-check the instructions on the fans if you are not quite sure.

Additionally, consider other fans in the system, such as the CPU and GPU fans that can also impact the flow of air within the system.

Top fans intake or exhaust:

Adding two or a pair of exhaust and intake fans each reduces the temperature from anywhere between two and five degrees.

Additional pairs will only see a reduced gain in the range of one or two degrees if it extends that far. It is better to regularly alter the positioning of the fans.

because it is likely that one of the fans in the top and one in the rear continually deliver lower temperatures than when both of them function.

Case fans guide:

Let us briefly cover the few essential things to consider how many case fans do I need?


Bigger fans expel and draw more air within the system by spinning fast. Also, it implies that the bigger fans are quieter though they may be huge for your case.

Case fans vary in size as measured in millimeters, starting from 360mm case fan to 80 mm. Remember to counter-check the correct size that you need before you buy them.


The speed of fans is measured by the number of revolutions per minute (RPM). When the RPM is higher, the noise level is also rising.

Despite the noise level rising, fans with higher RPMs have a better and higher cooling effect on the system.

Although the RPMs can be altered using software, the process is hectic with three-pin fans. Once you find a fan that suits your needs resist the temptations of the noise level putting you off.


The material that makes the fan determines its toughness and how long the fan can last. Fans curved out of leading materials make top models that always deliver on both durability and performance.

Also, consider the type of bearing used in the fan because some bearings last longer than others. Therefore, fluid bearings experience less friction and will last longer as compared to ball bearings

Noise level:

According to many users, the noise level is a critical consideration. Manufacturers always indicate the noise level of their products in dBA.

Fans of low levels produce fewer amounts of noise. Another factor that determines the level of sound is the number of revolutions per minute (RPMs), where fans running at higher RPMs give out higher noise levels.

Finally, We hope, you may know how many case fans do I need? A computer is an important gadget that you will not want to be damaged, and to improve computer efficiency: install a case fan for active cooling.

A considerable number of case fans are available in the market. Choose a computer fan that will best suit your needs.

Ahnaf Nihin is a senior content writer at Gametechia. He's having 10 years of experience in Technology and troubleshooting topics. Coming from a background in engineering, you will often see his writing stuff related to How To's, Android, and iOS.