> Range hoods with powered vents are required, by code, basically everywhere in the US and Canada. Some sort of fan is required. That fan is often a down draf

> Range hoods with powered vents are required, by code, basically everywhere in the US and Canada. Some sort of fan is required. That fan is often a down draft vent, or a vent that rises up from the back of the stove and sucks horizontally THEN down. These horrible setups are popular even in luxury construction. They do look nice after all. That said I am wondering if maybe they are better for NO2 emissions. They are terrible in every other way though, but are quite legal as indicated by their presence in new construction.