I just put my stack of Pis in front of a Noctua NF-S12A and it cools them all very effectively, even under heavy load, without the need for any goofy hardware t

I just put my stack of Pis in front of a Noctua NF-S12A and it cools them all very effectively, even under heavy load, without the need for any goofy hardware that blocks additions like the GPIO extender or any other HATs I may want to add. I bought an adapter to power it from one of the Pis. It’s an easy solution that works for many of them with negligible effort.