Thermally insulated window with ventilation ducts

Abstract From the Canadian patent

A thermally insulated window includes intake and discharge ducts extending between a pair of interconnected interior and exterior metallic frame pieces and dampers pivotably mounted on the ducts to open and close openings of the ducts which face the outside atmosperic air. The ducts and the dampers are made of a thermally insulated material such as a synthetic resin. The dampers are actuated by power transmitting mechanism which is disposed within the respective ducts and adapted to be actuated from the interior side of the window. The ducts dampers and the power transmitting mechanisms do not impair the thermal insulating properties of the window as a whole.