"Ultra quiet medium speed brushless DC fan, quiet sleeve-bearing design. This mini fan is used for cooling of printed material and active cooling of RepRap and 3D Printer hotend, extruder, Raspberry Pi, and electronics single board computers.
Typical applications is used in active cooling Used in conjunction with a heatsink to increase overall airflow. This is known as a forced air cooling system. Used in RepRap and 3DPrinter hotend active cooling. Cooling of electronics boards and parts Cooling CPU of RaspberryPi, Beableboard, OrangePi, BananaPi and other SBC."