Good case airflow

It is extremely important to have good air airflow through your computer case. Make sure to be getting heat away form the CPU and motherboard chipset. Most fans are cheap, I am considering buying myself a new one. When I search for a fan, I always look for something over 100 CFM. This will be a fan to replace my loud intake fan. I don't think I need a new CPU fan/heatsink. My CPU never goes over 30 degrees celcius.