fire damper

1. A passive fire protection product used in heating, ventilation, and air conditioning ducts.

2. A damper which closes off an air duct automatically in the event of fire so as to restrict the passage of fire and smoke.

3. (archaic, historical)A mine worker who detects and clears a mineshaft of firedamp by intentionally burning or blowing it up.

   Jack is a former fire damper who was injured in an explosion.

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