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Geekworm Raspberry Pi 4 X735 V3.0 Expansion Board with PWM Cooling Fan & Safe Shutdown & DC 6V-30V Width Voltage Input for Raspberry Pi 4B/ 3B+/ 3B / 2B : Amazon.it: Informatica
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PWM Regulated Fan Based on CPU Temperature for Raspberry Pi : 4 Steps (with Pictures) - Instructables
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GeeekPi 2PCS Raspberry Pi Ventola a velocità regolabile, Raspberry Pi ventola PWM, Raspberry Pi controllo velocità ventola 40mm 4010 Ventola DC 5V Radiatore silenzioso per gamma Raspberry Pi (Colore) : Amazon.it: Informatica
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GeeekPi Raspberry Pi Cooling Fan, Raspberry Pi Ultra Thin ICE Tower Cooler, PWM Cooling Fan with Raspberry Pi Heatsink for Raspberry Pi 4 Model B 8GB/4GB/2GB : Amazon.it: Informatica
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Amazon.com: GeeekPi 2PCS Raspberry Pi 4 PWM Controllable Fan, Raspberry Pi PWM Speed Adjustment Fan 40x40x10mm, Raspberry Pi Speed Control Fan DC 5V 4010 Quiet Fan for Raspberry Pi 4, 3 B+,
![GitHub - hamzab70/Raspberry-Pi-Fan-Script: Simple Bash script to control the fan speed using the Rapsberry Pi GPIO and a transistor. GitHub - hamzab70/Raspberry-Pi-Fan-Script: Simple Bash script to control the fan speed using the Rapsberry Pi GPIO and a transistor.](https://raw.githubusercontent.com/hamzab70/Raspberry-Pi-Fan-Script/master/Electrical-Scheme.png)