A duct fire damper is an essential safety device used in commercial and industrial buildings to protect against the spread of fire and smoke. It is a fire-resistant barrier that is installed in the ventilation system of a building to prevent the spread of fire and smoke from one area to another. The damper is typically installed in the ductwork and is designed to close automatically when a fire is detected. This helps to contain the fire and limit the spread of smoke and heat. The damper is usually made of metal and is designed to remain closed until the fire is extinguished. It is an important part of a building’s fire safety system and should be regularly inspected and maintained to ensure it is functioning properly.