I can highly recommend a case like this for Pi4 https://www.ebay.co.uk/itm/for-Raspberry-Pi-4-Model-B-Aluminum-Case-Passive-Cooling-Aluminum-Alloy-Pr-I6M9/362967021701?epid=20034378788&hash=item5482853885:g:UY0AAOSwUwRekBG0
If you're hitting heat limits in normal use, there is definitely something wrong with your case. Have you installed heatsinks? Only cost a couple of quid and make a big difference...
That's a good looking case
Looks good, but really works for passive cooling too. I bought a similar case and my pi4 tops out at about 60 degrees after twenty mins of 100% load.
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I can highly recommend a case like this for Pi4 https://www.ebay.co.uk/itm/for-Raspberry-Pi-4-Model-B-Aluminum-Case-Passive-Cooling-Aluminum-Alloy-Pr-I6M9/362967021701?epid=20034378788&hash=item5482853885:g:UY0AAOSwUwRekBG0
If you're hitting heat limits in normal use, there is definitely something wrong with your case. Have you installed heatsinks? Only cost a couple of quid and make a big difference...