Source? In Minnesota at least, I've lived in 5 houses between the years 80s to 2010s that all had external venting with gas stove tops (no remodels). Our new ho

Source? In Minnesota at least, I've lived in 5 houses between the years 80s to 2010s that all had external venting with gas stove tops (no remodels). Our new house we are building also is required to have external venting due to code. I know states have individual requirements, but in Minnesota it is required to exhaust to external air. https://up.codes/viewer/minnesota/mn-mechanical-code-2015/chapter/5/exhaust-systems#502.1 https://up.codes/viewer/minnesota/mn-mechanical-code-2015/ch... [EDIT] Code is from 2015 so at least since then.