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Airspeed Testing Ducts for Axial 4020 vs Blower 5015 fans (UNI-T UT363) — image 1
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Airspeed Testing Ducts for Axial 4020 vs Blower 5015 fans (UNI-T UT363)

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Airspeed testing ducts. Both get narrow in the middle and only then widens up to measure airspeed out of the duct.

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I made these when I was testing axial vs blower fans for print cooling. 5015 fan mounts just by friction, 4010 & 4020 fans mounts by basic 3mm wood screws.

Video if you want the details: 

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