A damper is a mechanical device that is used to control the airflow to a chimney. It is basically a metal plate that can be opened and closed to control the flow of air into the chimney. If your fireplace does not have a damper, then it is likely that it has a vent instead. A vent is a small opening in the wall of the fireplace that allows air to enter and exit. It is often used to allow cool air into the fireplace so that the fire will not overheat the area around it.
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