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Originally Posted by Ruiner
How do those BI's respond to deeper shrouding? That built in plenum looks pretty shallow.
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I've tried it, using a hollowed out 120x25mm fan body as a plenum.
I've tried both on the pull and on the push sides. My only airflow measurement was my CPU reported temps (on die, inaccurate, blah blah blah) - anyway, I saw no difference in temps, using a panaflo L1A at 5V and 7V but I
think the noise level went down slightly (unsure of this as my noise meter doesn't go low enough and as I wasn't able to do blind "A-B" tests it could have simply been a psychological effect). I
did try using my wife as a sound measurement device: after adding a plenum I asked her if she thought it sounded any
louder (was trying to set psychological expectations in the other direction) and she said "No... the same or maybe quieter?.
Finally, it's been pointed out to me that using a hollowed out fan body as a plenum may introduce some other problems (venturi - fan bodies have a "throat"). This throat isn't any smaller than the one the air just passed through (or is about to pass through - depending on push or pull) but maybe it
does have an effect - at least on the pull side (where air is approaching the venturi as a somewhat parallel stream), but maybe not on the push side (where the air entering the venturi is a disorganized torus)