Range hoods with powered vents are required, by code, basically everywhere in the US and Canada. Is "powered vent" supposed to imply exhausting to the exterior

Range hoods with powered vents are required, by code, basically everywhere in the US and Canada. Is "powered vent" supposed to imply exhausting to the exterior? While every home I've seen does have some sort of powered vent over a gas range, the overwhelming majority of them have recirculating vents rather external venting.