| 摘要 |
According to an embodiment of the present invention, a fire damper comprises: a cylindrical shape body interposed in a boundary portion between layers of a vertical exhaust air duct constructed in a vertical direction to a building; a blockade plate installed to be able to rotate between a first location opening an inner space part of the body, and a second location closing the inner space part of the body upon an occurrence of a fire; a control module installed in an inner side wall of the body wherein a sensor facing the blockade plate is installed; a shape-memory alloy coil member extracted when supplied with power through a control module or in an area having a temperature greater than or equal to a predetermined temperature, and relaxed when the supply of power stops or in a room temperature state wherein one end thereof is connected to the blockage plate and an other end thereof is connected to the control module; and an elastic member elastically supporting the blockade plate opened in a direction of the first location, wherein one end thereof is connected to a bottom surface part of the blockade plate and the other thereof connected to a side wall of the body. |
