This is a redesigned case based on Malolo's RPi4 Case.  This was designed to fit the WaveShare CM4 IO board with PI 4 Compute Module.  The case has a 40mm fan design to blow air across the top then around the side and to the bottom to cool the NVMe installed on the bottom or the board.  All other venting holes were plugged but still show for looks.  Holes on the bottom are for cooling the NVMeafter the air cools the top area.

Board can be found at [https://www.waveshare.com/product/raspberry-pi/boards-kits/compute-module-4-cat/cm4-io-base-b.htm](https://www.waveshare.com/product/raspberry-pi/boards-kits/compute-module-4-cat/cm4-io-base-b.htm)