Definitions from Wiktionary (fire damper)

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



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