The CKV hood that is considered the most energy efficient is the hood that can be installed over cooking equipment and exhaust the lowest amount of exhaust air.
An example of an energy efficient hood is a hood that uses advanced aerodynamic technology that incorporates airstreams into the front lower edge of a hood that create an active front edge that reduces the amount of exhaust air that is required to facilitate capture an containment in similar hoods by as much as 40%.