A computer fan can be any fan inside a computer case used for cooling purposes, and may refer to fans that draw cooler air into the case from the outside, expel warm air from inside, or move air across a heatsink to cool a particular component.

• Case mount, used to aerate the case of the computer
• Power Supply fan often plays a double role, not only keeping the PSU itself from overheating, but also removing warm air from inside the case.
• CPU fan, used to cool the CPU
• Graphics card fan, used to cool the GPU and/or memory on graphics cards.
• Chipset fan, used to cool the Northbridge of a motherboard's chipset or for system bus overclocking