| 摘要 |
A flue insert (50) for insertion into a flue stack (12). The flue insert includes a sleeve (52) that is inserted into the stack so as to function as part of the stack. A vane (54) is disposed in the sleeve. One end of the vane is fixedly attached to the sleeve. The opposed end of the vane is adjustably attached to the sleeve so that after the insert is installed, the overall length of the vane can be selectively set.
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