Low-Profile CPU Cooling Fan for Raspberry Pi 4B/3B+/3B, with Aluminum
The Raspberry Pi 4 has a fan now - the Case Fan | Jeff Geerling
Raspberry Pi Fan 40x40x10mm DC 5V (low noise)
Black ABS Case for Raspberry Pi 4 with Cooling Fan
CanaKit Raspberry Pi 4 Cooling Fan - The Tech Journal
Raspberry Pi 4 Case Fan | Elektor
Miniature 5V Cooling Fan for Raspberry Pi (and Other Computers) : ID 3368 : $3.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Raspberry Pi 4 Model B Embedded Aluminum Alloy Armor Heatsink with Fan – Geekworm
Amazon.com: GeeekPi Raspberry Pi Cooling Fan, Raspberry Pi ICE Tower Cooler, RGB Cooling Fan with Raspberry Pi Heatsink for Raspberry Pi 4 Model B & Raspberry Pi 3B+ & Raspberry Pi 3
Amazon.com: 4PCS 30x30x7mm Fan for Raspberry Pi, Dorhea for Raspberry Pi Cooling Fan Brushless 3007 Fan CPU 3.3V 5V Cooling Fan for Raspberry Pi 4 Model B, 3 B+, Pi 3, Pi