When I had a rack at home, it was a silent one (so almost completely sealed). I had a fat duct coming in from the outside into the bottom of the rack and another fat duct taking the hot air from the top outside. But in winter, I made sure it was blowing that hot air into the living space.

Because of jellyfin? Mine is restricted to 3GB and runs happily on raspberry pi 4. I've even had it run on 2GB pi4 and it only struggled occasionally.