How fast the fan spins is measured in rounds per minute (RPM)… Personally, I do think this is kind of a not-so-useful spec.
A simple way to test the airflow direction is to put a piece of tissue in front of the fan and see which way it goes – If it gets sucked into the fan or gets blown away. The horizontal arrow indicates the airflow direction.ĭon’t worry if these arrows are missing on the fan.The vertical arrow indicates the direction of where the blades spin.On most modern fans, you will find 2 arrow indications: It measures from edge-to-edge, and the common standard fan sizes that you will find in the cyber world are:įan Size Distance Between Screw Holes 40 mm Just as in the above introduction, the dimensions of a computer fan is very straightforward. How difficult can it be? Well, here are some of the important technical stuff to know about computer fans.įAN SIZES (DIMENSIONS) A 120mm computer fan