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A Case Fan refers to a device used in electronics and computers, including desktop and tablet computers, to circulate air within the system's enclosure. It is designed to help regulate temperature and keep the internal components cool, thus ensuring optimal performance and longevity of the device. These fans come in various sizes, speeds, and designs, with some featuring LED lighting for added aesthetics. They are typically attached to the computer case using screws or clips and can be controlled via the system's BIOS settings or through third-party software. Overall, a Case Fan is an essential component of any electronics setup that generates heat and requires proper ventilation.