One of the most important features of any case fan is the amount of airflow it can generate. CFM stands for cubic feet per minute. This unit measures how much airflow is generated through an opening. CFM ratings that are higher mean more airflow, which can reduce temperatures and improve performance.
Case fans that provide a lot of airflow but are very quiet are the most in-demand. You need to consider what type of fan you want, how noisy it is, and your budget.
The Noctua NF-14PWM140mm 140mm case fan, for example, is a great fan option. It has a PWM connector, and comes with a 3-year warranty. The product also has interchangeable colored corner panels making it one of most customizable on the market.
Another high-performance case fan that is worth considering is the ARCTIC F12 PWM Rev.2. The ARCTIC fan can produce 53 FCM air flow, a significant amount of airflow. Despite the high airflow, the ARCTIC fan F12 is quite noisy. Fortunately, the PWM function can be turned off, allowing the fan to run at a low RPM.
ARCTIC F12 offers high performance but has a lower noise than many of its peers. The noise level is less than 36 dBA. This allows it to be operated at a slower speed, which reduces its effect on the performance of your system. It has a PWM function that allows you to adjust the fan speed.
Another fan that performs at a reasonable price and produces a substantial amount of airflow is the Silent Wings 3. It has a 6-pole motor but can produce over 100 square feet of airflow. This is much more than you would expect from a smaller fan. However, the case fan doesn't produce as much noise as an ARCTIC fan.
Silent Wings 3's impressive airflow capabilities are not the only thing that is noteworthy. A focussed flow frame helps to reduce noise and concentrate airflow. The unit also includes eleven stator guide vanes and a six-pole motor.
Rosewill 120mm Sleeve Long Life Sleeve This fan produces the most airflow out of all the top case fans. It circulates more air and cools your PC quicker than the rest. The Rosewill 120mm Long Life Sleeve is small in size but has a maximum RPM 2000. Its RGB lighting is however the fan's favorite feature. This is not a feature you should have, but it's an awesome feature.
It doesn't matter which model you choose; you'll need some screws and a battery. Although most models include these, some may need you to connect jumpers.