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ES 40mm 400-15.000rpm Fan ( 40x40x28mm ) - Two Ball Bearing - PWM [1020163] from WatercoolingUK
40mm Cooling Fan for NVIDIA Jetson Nano | PWM Controllable
2pcs Gdstime 40mm Pwm Fan 4-pin 12v 40x40x28mm Dual Ball Bearing 4cm High Speed Brushless Dc Industrial Cooling Axial Fans - Fans & Cooling - AliExpress
Amazon.com: Dedicated DC 5V Cooling Fan Compatible with NVIDIA Jetson Nano Developer Kit and B01 Version PWM Speed Adjustment Strong Cooling Air Fan 40mm×40mm×20mm with 4PIN Reverse-Proof Connector : Electronics