In this tutorial I’m going to show you how to create the chimney flues with the Body Modifier in AutoCAD Architecture.

At the bottom of this tutorial you can find a video screencast showing you how to create the chimney flues with the Body Modifier.

How To Create Chimney Flues with the Body Modifier

The two flues, started from different height of the chimney, are created that the Box shaped Mass elements are placed in the chimney body, (which is wall), and they are extracted from the chimney body by the Body Modifier.

  1. On the Tool Palette change to the Massing palette.
  2. AutoCAD Architecture - Massing Palette

  3. Click on the Box tool icon on the palette.
  4. AutoCAD Architecture - Box Tool

  5. Before the insertion set the dimensions of the first rectangular body.
    Set the value of the Specify on screen parameter to No,
    the Width value to 250 [10”],
    the Depth value to 250 [10”],
    the Height value to 9300 [30’-6”].
    The 9300 mm [30’-6”] flue height comes from that the bottom of the chimney, started from the ground level, will be 300 mm [1’-0”] far down the floor level of the ground floor, and the flue has to start 400 mm [1’-4”] far from the floor level of the ground level.
  6. AutoCAD Architecture - Dimensions

  7. After returning to the drawing area, put the first flue body to any place, next to the chimney, and press ENTER to accept the offered 0 (zero) rotation value.
  8. AutoCAD Architecture - Rotation Value

  9. Program prompts at once the next body insertion point, but first you have to go to the Properties palette and set the dimensions of it.
    At the second flue all data remains unchangeable, only the Height is changed to 6300 mm [20’-6”]. (This flue will start 400 mm [1’-4”] far from the first floor level.)
  10. AutoCAD Architecture - Height

  11. The second flue is put eye-to-measure only below the first, outside of the chimney body, and accept 0 (zero) rotation value, as well.
  12. Press ENTER to finish the recursive operation of the insertion mass element.
  13. AutoCAD Architecture - Finish The Recursive Operation

  14. From the Ribbon, Home tab, Modify panel, start the AutoCAD Move AutoCAD Architecture - Move Commandcommand and snap to MIDpoint and move the top (higher) flue to the upper midpoint of the chimney body, the lower flue to the lower MIDpoint, like in the figure.
  15. AutoCAD Architecture - Midpoint

  16. Select the upper flue mass element.
  17. After clicking in the displayed center grips (become red) the dimension inputs of the flue movement display and the dimensions of vertical movement indicates with blue color that it is active.
  18. Press once the Tab button on the keyboard to make the other dimension input active, which is responsible for vertical movement, (after some time it becomes blue). Start to drag the Mass Element down and then type 125 [5”] value of the movement and press ENTER.
  19. AutoCAD Architecture - Specify Stretch Point

  20. Use the above method to move the lower flue up with 125 mm [5”].
  21. AutoCAD Architecture - Move The Lower Flue

  22. Select the upper flue and set the Elevation parameter value to 700 mm [2’-4”] on the Design Tab of the Properties palette.
  23. AutoCAD Architecture - Elevation 700

  24. Press ESC to throw away this selection.
  25. With similar method set the lower flue Elevation value to 4700 mm [12’-4”].
  26. AutoCAD Architecture - Elevation 4700

    NOTE: Since this elevation is above the Cut Plane, Mass Element may seem only in dashed display.

  27. Select the wall of the chimney body, from the Ribbon – Contextual Wall tab – Modify panel choose the Add command from the Body Modifiers drop-down list.
  28. AutoCAD Architecture - Choose The Add Command

  29. To command prompt select the two Mass elements as the body modifier, then press ENTER.
  30. Notice that at the top on the displayed Add Body Modifier panel, the Brick Veneer component is set (as a single layer wall, it cannot be other).
    Set the type of the Operation to Subtractive.
    Type Flues in the Description.
    Turn on the Erase Selected Object(s).
  31. Close the panel by pressing OK.
  32. AutoCAD Architecture- Add Body Modifier

  33. As a result the status can be seen like in the figure. The second flue disappears because you are in the ground floor drawing, and its Global Cut Plane is set above the floor level by 1400 mm [3’-6”], so it does not intersect the second flue.
  34. AutoCAD Architecture - Result

I hope you enjoyed this part of the AutoCAD Architecture video tutorials series. In the next article I’ll show you how to insert objects to a new construct drawing. If you liked this tutorial make sure you subscribe for more in the upper right corner (where you can also download the first chapters of my AutoCAD Architecture eBook free) and also subscribe to my YouTube channel.

If you would like to create the whole project of a two-story house with Sheets and Annotation, please follow the link and buy my eBook, which guides you step by step (Imperial and Metric version available).