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Another tip: Blowing air <i>onto</i> a component, instead of sucking it away, is much more effective for cooling. Basically if you put your hand where the cooled component is you should be able to feel the airflow.<p>In practice this meant flipping the "exhaust" fans in one of my systems. It resulted in temperatures that were consistently a few degrees lower. Note in this instance there wasn't any ducting involved.
In April 2025, LinusTechTips visited NASA's Langley Research Center at the invitation of the Flow Physics and Control Branch to seek an answer to the question: how far does a case fan have to be from a flat surface?<p>The article - authored by Dr.Louis Edelman - delves deeper into the test design and components, expanding on the approaches and methods used.
Was this one of the trips on the good-as-new plane? The video was an interesting watch.