The StarTech.com PC case exhaust fan is an add-in cooling fan designed to fit in the PCI or ISA expansion slots of any computer. It is used to exhaust warm air out, preventing problems due to overheating components. The exhaust fan inlet faces adjacent PCI or AGP cards and makes a great video card cooler for hot running 3D accelerator cards like the Voodoo, TNT2, GeForce256 and others. Power is supplied to the fan using a standard LP4 (hard drive power connector) pass through plug.