| 摘要 |
PROBLEM TO BE SOLVED: To provide a fire damper for double pipe-line duct and its operation mechanism, in which two fuse assemblies are provided on the wall of one side of the cylindrical body, and an operation mechanism of a closing blade which interlocks with the fuse assembly and closes the pipe-line in the inside of the cylindrical main body. SOLUTION: In the fire damper, the bases of two fuse assemblies 3a, 3b are attached on the wall of one side of the cylindrical main body 2. A long fuse assembly 3b is passed through a through hole in a partition wall 21, and its tip end is positioned in the pipe-line P2.
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