From the previous post we can see that the exhaust fan are are very important for PC. But if we look at the market there are tons of Case fan and we confuse what should we buy . many people think RPM of fan is main thing but ..
The Fan manufacture company highlight the RPM (Revolutions Per Minute) of Fan. Almost many people believe that RPM is responsible for cool down the case. But in reality that is not true. There are 3 thing that depend on cooling your PC case or CPU cooler and they are CFM known as the airflow and air pressure which is known as the mmAq. The air flow tell how much air can it transfer and the air pressure help use to flow the air faster. For cooling the PC case the CFM means the air flow is main thing. Now in many brand or non brand Fan you may see that there is no information of airflow and RPM. So how know?
The Basic RPM of fan is 800 RPM and the CFM is below 40. Many Company copy the design of branded company like DeepCool and Lian li and sell it at a cheap price. It has a nice ARGB and design but the CFM is below then 50 or 68 CFM. but don't be confuse some chinese brand also make good Fan like lovingcool etc. So always check the RPM and CFM of Fan not just the ARGB and design.
Now the last question stand for your , is normal CFM Fan is enough for you or not?
The answer is : It depend on your computer, mainly specification of your computer
Suppose your PC has 4 core processor which draw max 30 watts and you have 2 storage device and a GPU which only draw 75 watts power, in this case a normal case Fan will do the work. but if your PC has high-end system like 6-8 core processor and 120 watt GPU then you need Fan which is 68 CFM air flow.
and the last thing is the blade quality is also responsible for airflow. but identify which blade has good is really hard for new and old gamer so focus on the air flow.