What is a fire door ?

What is a fire door ?

A door designated for entry of firemen into a building for fire-fighting and evacuation
Rear door of a fire tender for quick debussing by firemen
A highly fire resistant door system that provides a degree of fire protection when closed
None of the above
This question was previously asked in
UPSC CISF-AC-EXE – 2018
A fire door is specifically designed to resist the passage of fire and smoke for a defined period of time. When closed, it acts as a barrier to contain fire within a compartment, preventing its spread and allowing occupants time to evacuate and firefighters to respond safely.
The primary function of a fire door is to provide a degree of fire protection by compartmentalizing a building and resisting fire spread.
Fire doors are subject to strict testing and certification standards (e.g., as per building codes like NFPA 80 or national equivalents). They are typically part of a larger fire safety system, including fire-rated walls and floors. Proper installation and maintenance are crucial for their effectiveness. Options A and B describe functions or parts related to fire fighting operations or vehicles, not the architectural component known as a fire door.