fire door

noun

Definition of fire door

  1. 1 :  the door or opening through which fuel is supplied to a furnace or stove

  2. 2 :  a fire-resistive door; specifically :  an automatic door secured in the open position by a fusible link or thermostatically operated device designed to release the door under the influence of heat and permit its closing by gravity or by weights or other contrivances

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