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Wha ... who came up with this rule? Maybe it's better for the carbon filter to not have the blown air concentrated on one spot, as you might get with a small fan pointed at a large filter, but whose idea was it that fans do better sucking than blowing?
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We (you will find reference to this in several places on this site) don't consider it so much a rule as it is following the information provided by the fan manufacurer. Both Vortex and Fantech state in their documentation that placing centrifugal fans in the pulling position is most effective. They provide documentation on their websites. Feel free to check it out.