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Originally Posted by pHaestus
That middle piece isn't doing what you'd hope.
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Hmmm...
My only data point is with two undervolted (5V) panaflo L1A fans stacked pulling through a be-cooling core (6x6) in a coolingworks shroud. Adding a gutted 25mm fan as a spacer reduced noise a bit and dropped reported-by-CPU-diode temps by ~.5C (sometimes same as before sometimes 1C lower).
To the extent that fan blades are wings and use the coanda effect, you need to not obstruct the top (lifting) surfaces. It's
possible that one set of blades (or more likely, one set of struts) was interfering enough that a spacer helped. Might be something else going on, too.
With all that said - what
is bad about using a hollowed out fan frame as a spacer?