n. a door constructed to provide a specific degree of fire protection
Doors that building codes and the NFPA classify according to a rating system related to their fire resistance, such as 3-hour, 1 1/2-hour, 1-hour, etc.
A door or shutter, provided for the passage of persons, air or objects, which together with its frame and furniture as installed in a building, is intended, when closed, to resist the passage of fire and/or gaseous products of combustion, and is capable of meeting specified performance criteria to those ends. (BS 5599-11 and AD B)
A door that has a fire protection rating and will close the floor automatically in case of fire.
a fire-resistant door that can be closed to stop the spread of a fire
the entrance to the firebox, through which coal is shovelledk, is closed off by a fire door.
A door of a construction type which has been tested to contain the spread of fire from one room or occupancy area to another. Fire doors are listed and labeled to show their ratings in terms of time, i.e., 20-Minute, 90-Minute, etc.
A door designed to resist the passage of fire. Fire doors are rated by the amount of time they can resist the penetration of fire with the time ranging from one-half to three hours. Fire doors are used to close openings in firewalls, so that the door area is no more vulnerable to fire than the wall.
A specially constructed, tested, and approved door installed for the purpose of preventing the spread of fire.
A fire door is a type of door, or closure used as a passive fire protection item within buildings to prevent the spread of fire. It is usually the only means of allowing people to pass through a fire-resistance rated wall assembly.