My ferm chamber is a fridge with an Inkbird and I don't run it through anything. I just let the rubber door seal close over the cable. Same with the cord for the Fermwrap I use for heating. Crude but effective, as long as the configuration of your door seal doesn't put too many kinks in it. I did the same with the temp probe for my lagering chest freezer. The only thing I've tidily run it through is my keezer, because I knew it was safe to drill through the collar.