Fire dampers are essentially fire safety metal curtain devices that fall within your buildings air ventilation ductwork systems in the event of a fire within a building. They are designed to stop fire and smoke spreading through a building and are strategically positioned at various places where ductwork passes through fire compartment walls, floors or zones within a building.
They are life saving pieces of equipment and a vital part of a buildings fire safety, designed to help contain a fire within a certain zone for a period of time, so that a building can be evacuated and fire fighters can reach and concentrate their efforts on a blaze that has been kept within a contained area of the building