Argon Fan HAT for Raspberry Pi 4 Model B and Raspberry Pi 3 Model B | 40mm Raspberry Pi Fan with Power Button | PWM and Software Controllable | Easy Setup
Brand: Argon Forty

The Argon Fan HAT is a simple Raspberry Pi HAT that cools the Pi and gives it a safe shutdown button. With just a one-line script, you'll have full functionality for the HAT, allowing you to do additional features such as rebooting the pi, and adjusting the fan speed of the single board computer. You can even program when the fan adjusts its speed, giving you full control over the HAT. Get ready to use this in any Raspberry Pi Case that offers HAT support, such as the Argon POLY+ or the Argon NEO. The best part is that this will work for the Raspberry Pi 4 B, the Raspberry Pi 3 B, and the Raspberry Pi 3 B+.

A Raspberry Pi Hat with a cooling fan that prevents overheating on the Raspberry Pi 3 B and Raspberry Pi 4 so that you can use the boards to your heart's content.
The Argon Pi 4 Fan HAT also comes with a power button that can be used to do safe shutdowns and reboots to the Pi; making it easy and safe to shutdown your boards.
The Raspberry Pi 4 Fan HAT is also PWM Controllable and Software controllable fan for full functionality and customizability while cooling your Pi Board.
The Raspberry Pi Fan HAT is highly usable and flexible in a variety of Pi Projects, especially for Raspberry Pi Servers where Raspberry Pis are stacked.
The Raspberry Pi 4 Argon Fan HAT easily fits in Official Raspberry Pi Cases and other Argon40 Cases such as the Argon NEO case and Argon POLY+ Vented Cases.