Yes you CAN power a 12v PC fan via the GPIO 5v power headers : r/raspberry_pi
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Fan-tastic Misuse Of Raspberry Pi GPIO | Hackaday
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cooling - Is it safe to connect a 3.3v fan to gpio instead of power? - Raspberry Pi Stack Exchange
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Automatically Control Your Raspberry Pi Fan and Temperature - Howchoo
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Raspberry Pi fan pins (easy cooling solution) — PiCockpit | Monitor and Control your Raspberry Pi: free for up to 5 Pis!
How to connect a fan to a Raspberry Pi • freva.com
CanaKit Raspberry Pi 4 Cooling Fan - The Tech Journal
Buy a Raspberry Pi 4 Case Fan – Raspberry Pi
CanaKit Raspberry Pi 4 Cooling Fan - The Tech Journal
The Raspberry Pi 4 has a fan now - the Case Fan | Jeff Geerling
Raspberry Pi 4 Case (with cooling fan) Assembly Guide | The Pi Hut
Miniature 5V LED Cooling Fan for Raspberry Pi (30mm) | The Pi Hut
