What is a fire door ?

A fire door is a critical component of a building's passive fire protection system. Its primary purpose is to compartmentalize a building, preventing or delaying the spread of fire and smoke from one area to another for a specified period. This protection is effective only when the door is closed.

• Fire doors are constructed from fire-resistant materials such as steel, gypsum, or specially treated timber and are fitted with fire-rated hardware.
• They are assigned a fire-resistance rating (e.g., 30, 60, or 120 minutes) based on their ability to withstand heat and flames during standardized testing.
• While Option A describes a fire access point and Option B describes a vehicle feature, only Option C captures the technical definition of a fire door's function in structural safety.