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The function of the processor cooling fan is to pull and blow the hot air from the processor, and bring in cooler air into the processor. There are two types of cooling systems among CPU computer accessories: air coolers and liquid coolers / water coolers. Air cooling they are the most common type of cooling system used in PC’s today. PC air cooling systems are consistent, cost-efficient, and easy to install. Liquid cooling systems are available in many variations but are most commonly seen as Liquid / water coolers, also known as closed-loop liquid coolers or all-in-one (AIO) CPU coolers.