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Originally Posted by naturall_mystic In other words have your fan sucking or pulling the air, not blowing or pushing the air. |
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?
In any event, such a rule, if true, is going to depend strongly on the type of fan - blade geometry and what not.
If you're going to be using ducts or a carbon filter, use a bathroom exhaust fan, or an inline fan, as long as it's a
centrifugal fan. People have rightly observed that computer fans can't pull squat through a carbon filter; the same holds true for most propellor fans. Computer fans are fine as long as you're exhausting directly to the room and the intake is quite clear or has a similar fan on it as well.