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Miniature 5V Cooling Fan for Raspberry Pi (and Other Computers) : ID 3368 : $3.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Dedicated All-In-One 3007 Cooling Fan For Raspberry Pi Compute Module 4 CM4, Speed Adjustable, With Thermal Tapes | CM4-FAN-3007-B
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