What do you call a device that closes automatically upon detecting heat to restrict airflow and flame passage?

A device that closes automatically upon detecting heat to restrict airflow and flame passage is known as a fire damper. This device plays a crucial role in the fire protection system within buildings. When a fire occurs, it is essential to prevent smoke and flames from spreading through the building's ductwork, which is where the fire damper comes into play.

The fire damper is designed to close in response to the heat generated by a fire, thereby blocking the passage of flames and smoke through the air ducts. By doing so, it helps to contain the fire to the area of origin, allowing for safer evacuation of the building and more effective firefighting efforts. This function is vital in maintaining structural integrity and protecting occupants from smoke inhalation and fire spread.

Understanding the role of a fire damper in fire safety systems is critical for anyone involved in building management or safety protocols, as it significantly contributes to the overall effectiveness of fire containment strategies in facilities.