Noctua 40x40x10mm 5 Volt Fan NF-A4x10 – Coolerguys
Noctua NF-A4x10 PWM 3pin/4pin 12V/5V Case Fan 40x40x10mm Thin Fan PWM Intelligent Temperature Control Ultra Small Fan
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Noctua NF-A4x20 FLX 12V Quiet Computer Cooling Fan 40mm
Unnecessary but I love it. (5V 40mm on 52pi cooler for pi4) : r/Noctua
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