This type of door use as a part of a passive fire protection system within buildings to prevent the spread of fire or smoke between separate sections.
Fire door leaf (the swinging panel of the door) which also meet fire rated regulation, Smoke seals, door hardware and structure that hold the fire door assembly in place.
Normal Operation
Most fire doors should be kept closed at all times, however some are designed to stay open under normal circumstance, only to shut automatically in the event of a fire.
The door movement should never be impair by doorstop or other obstacle.
The instrument and smoke-seal bounding of fire doors should be routinely checked, as well as the door closer and handle.
