Raspberry Pi 4 Model B Aluminum Case with Dual Cooling Fan Metal Shell Black Box for RPI 4B (With Dual fan)

This is to be used with a RPi4 running Freeswitch PBX software which is a medium processor intensive program. Thus keeping CPU temperature down is important for reliability. This fan does that. One point I did have trouble with is the included self-adhesive heatt conductive pads. These are quite thin (good) but the peel off strips protecting the adhesive are difficult to separate and I did tear one of the pads in the process. However sufficient pad was saved to stick to the appropriate chip case. I will probably buy this again.

Really good thermals... only bad thing is the silent fans have started making noise!

Would have given this 5 stars if I could attach the fans but unfortunately the supplied screws are too small and no screws in my toolbox have the correct thread - disappointing. Not sure if this is manufacturing defect. I've had to settle with double-sided sticky tape for the time being

The Pi4 has a reputation for running hot, although in my experience it's the Pi3B that runs a few degrees warmer. I started using this style of heatsink/cooler with the Pi3B and found it very effective indeed. It's just as effective with the Pi4. I use it on a Pi4 backup NAS, currently idling at 30C, on a Pi4 NextCloud server, 28.2C. I also have a Pi3B test box, with the same style of cooler, which has just finished a compile hitting 100% CPU and that went up to 58C. It's now idling at 32C. If you need to get at the slots, ports and pins, this case is ideal. I think it looks tidy and better than a bare board. It was the neat, utilitarian look of them that first caught my attention. The cooling is excellent and the fans are very quiet. I know that sometimes they can start to whine (like any small fan), but if a blast from an air-cleaner doesn't fix it, replacements are available all over the place from £2.50 upwards - and they're dead easy to install.