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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. Roughly select four two points on the top and bottom of the rectangle where there will be a heated section.

Dimensions and Constraints

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Under Sketching Toolboxes, select Dimensions tab, use the default dimensioning tools. Then click on the lines and drag upwards or sideways as the case may be to place the dimensions (V1, H2, H3, H4). Note: For horizontal dimensioning (shown in H2, H3 and H4), click first on the horizontal dimension tab under the dimensions tab and then click (turns pinkyellow) on any the end points of the split section lines (H2, H3 and H4). Then click on any point on the y-axis and drag up. For the vertical dimensioning (V1), click on the vertical dimension tab under the dimensions tab. Then click  on the y-axis where V1 is located (turns pinkyellow). Then drag V1 to the left side. Dimensioning of the geometry is shown below:

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