Fire damper is installed on the ventilation duct with fire requirement, used to prevent the fire from spreading. When on fire, the temperature in the duct reaches 70℃, the fire damper will automatically close quickly to avoid fire spreading. According to the shape, there are rectangular & round type. According to the control way, there are manual, electrical, pneumatic type.The blade can be single blade or multi-blades. The fireproof class can reach A60.">Fire damper is installed on the ventilation duct with fire requirement,used to prevent the fire from spreading.When on fire, the temperature in the duct reaches 70℃, the fire damper will automatically close quickly to avoid fire spreading. According to the shape, there are rectangular & round type. According to the control way, there are manual, electrical, pneumatic type.The blade can be single blade or multi-blades. The fireproof class can reach A60.