air damper; draft regulator
A device in a chimney or ventilation system that controls airflow. Technical term used in architecture and traditional heating.
An air damper is installed in the chimney to regulate the airflow.
wind door; ventilation door
Archaic term for a door or opening designed to let wind pass through, often to cool a room. Not used in modern Japanese.
In old houses, they opened the wind door in summer to cool the room.