fire damper

== English == === Alternative forms === firedamper === Noun === fire damper (plural fire dampers) A passive fire protection product used in heating, ventilation, and air conditioning ducts. A damper which closes off an air duct automatically in the event of fire so as to restrict the passage of fire and smoke. (historical, archaic, mining) A mine worker who detects and clears a mineshaft of firedamp by intentionally burning or blowing it up.