Fire Dampers

Devices designed to impede the spread of fire through walls, floors and partitions. Fire dampers are installed in the ducts of heating, ventilation and air conditioning systems which penetrate fire-resistant constructions. When a rise in temperature occurs, the fire damper closes, usually activated by a thermal element which melts at temperatures higher than ambient but low enough to indicate the presence of a fire, allowing springs to close the damper blades. Fire dampers can also close following receipt of an electrical signal from a fire alarm system utilising detector remote from the damper, indicating the sensing of heat or smoke in the building occupied spaces or in the HVAC duct system.