Which feature is commonly associated with fire doors?

Fire doors are specifically designed to provide a barrier against the spread of fire and smoke, making fire resistance their primary and most critical feature. They are constructed using materials and techniques that can withstand high temperatures for a specified duration, which is typically rated in terms of time (such as 30, 60, or 90 minutes). This fire resistance allows them to protect escape routes, provide safe zones, and minimize damage to property in the event of a fire.

While other features like thermal insulation and acoustic properties can be relevant in the context of fire doors, they are secondary to the main purpose of serving as a fire control measure. Fire doors must meet stringent building codes and safety standards to ensure they effectively slow the progression of fire, protecting lives and property.