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FAQ: Should the fan be mounted sucking away from the heat-sink or blowing onto the heat-sink?
How to Manage Your PC's Fans for Optimal Airflow and Cooling
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Does the fan direction for the CPU cooling make a difference? - Quora
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Why Is My Fan Running at High Speed? - Ask Leo!
Fan and heatsink - suck or blow? - Electrical Engineering Stack Exchange
How To Tell Which Way A Fan Blows
