The fire resistance of the door depends on it.
Fire rated door components.
Fire rated doors are made of wood common or fire resistant metals galvanized metal or steel that have been insulated rock wool mineral wool perlite etc.
Fire leaf as the main parts of the door.
Fire rated door components.
Fire doors are made up of various components.
A fire door is a door with a fire resistance rating sometimes referred to as a fire protection rating for closures used as part of a passive fire protection system to reduce the spread of fire and smoke between separate compartments of a structure and to enable safe egress from a building or structure or ship.
The door itself is usually made from a solid timber frame but they can sometimes be covered again in fire resistant glass.
In north american building codes it along with fire dampers is often referred.
The structure of the door is determined according to the requirements of the door.