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A fire rated door, also named fire door, is a door with a fire-resistance rating 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.
Many countries promulgate laws enforce national standards for fire doors. You will find fire doors not only in the assembly occupancies, but also in your kitchen room, basement, stairway and service room, even they look like normal doors.
Don’t save too much on fire door when making the purchase budget, because it is so important to protect you from accidents.