Gamecube 40mm fan adapter plate and fan cable - Retro Frog - Stone Age Gamer
Raspberry Pi 4 - 40mm Fan Comparison - Martin Rowan
Creality Noctua NF A4x10 PWM 40mm x 10mm Ultra Quiet Silent Fan 12V 3 Pin Premium Cooling Fan for CR 10/CR 10 S5 mini 3D Printer|3D Printer Parts & Accessories| - AliExpress
Installing Noctua 40mm fans in my router
Noctua NF-A4x10 5V Quiet Cooling Fan 40mm
Unnecessary but I love it. (5V 40mm on 52pi cooler for pi4) : r/Noctua
NF-A4x10 FLX
Noctua A4x20 PWM 5.53 CFM 40 mm Fan (NF-A4x20 PWM) - PCPartPicker