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Old 03-13-2019, 09:42 AM   #3 (permalink)
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Join Date: Jul 2009
Location: Central FL

CCI Phantom Fan
I imagine these would only be limited to a small range of frequency that works with the design.

I would of also liked to see what happens if someone put a solid plastic ring with the same outer dimensions as a comparison. Plus the actual sound levels inside and out side of that tube (those stuck in an MRI are inside the damn thing after all). My engineering brain is telling me "this is cool, but I need more information."
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