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Since we have a heated section in the middle of the pipe, we need to split the geometry appropriately. Click Modify tab and select Split. Select two points on at the top of the rectangle, where there will be a heated section. Then select two points at the bottom of the rectangle, where there will be a heated section.

Now we can constraint the lower rectangle with the top of the rectangle. Click Constraints tab, select Equal Length. Click the appropriate top and bottom edge and set them to be of equal length. This is shown below:

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