Does casing fan help you?

Air flow in casing is very important for your computer. If there is no airflow then your PC can be get hot. In order to cool your PC , casing fan is needed. The number of casing fan is depended on your case
So how many fan do you need

There are only mostly 1 rear fan and 2 or 3 font fan is install on a case. The most important fan of the case is the rear fan. This fan job is to take out the trap air from the case. But all of the case require the rear fan . because this fan keep the case cool. font fan are necessary if there is temper glass in your case or the GPU is mounted very low to the case surface. there are two way air get in a case. Usually there are some hole in the side panel of the PC case (if the side panel is not temper glass) and in the front of the case there are some little hole or a gap for the air. when the rear fan take out the air. the air of the out side get in the case from the side panel and from the font. but modern PC case has temper glass  side panel and without hole so only way to get the air come is to the front case fan. 

 

Now question is which fan should you buy. there are two type of fans in market. one is normal fan other one is performance fan the main difference is they can transfer more air. You can check the fan description. where can you can find the CFM. The more CFM fan the better air that fan can transfer.
 

now another question is do you need all performance fan or not ?
the answer is you can use all performance fan if you don't have any budget issue but if you value your many then take only one performance fan and mount it to the rear back panel. As I said before the rear fan take out the heat. if the air flow is high then less heat will be your case.

In the end the font fan will be take the air in and performance rear Casing fan will take out the heat.