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Hull and Outfitting

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Rectangular Components - Breeches Threeway

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  • Last UpdatedJan 13, 2026
  • 2 minute read

The task of creating an HVAC Component is initiated from the HVAC Window.

  1. Select Rectangular in the Categories dropdown list and then Breeches Threeway in the Available Type dropdown list to display the Breeches Threeway window:

    You are required to input the following dimensions:

  • Duct width AA

  • Duct depth AB

  • Duct width LA

  • Duct depth LB

  • Branch width

  • Overall length

  • A offset

  • B offset

  • Cutback Depth

  • Gap

  • Arrive Extension

  • Leave Extension

  • Branch Extension

    1. To visualize how the dimensions equate to the actual piece of HVAC, select Picture to display a detailed drawing for Rectangular Components Catalog Element - Breeches Threeway.

      Note: The fields will be pre-populated with default dimension. These dimension are governed by the details defined in the HVAC Catalog. The Arrive and Leave Extension default is auto but can be changed by the user to a required direction.

    2. Select Transpose width/depth to exchange Duct Width AA dimension with Duct depth AB dimension or to exchange Duct width LA dimension with Duct depth LB dimension.

    3. Specify a type of joint to use for the Arrjoint (Arrive Joint) and Leajoint (Leave Joint). For a detailed description, see Create / Modify HVAC Components.

    4. After selecting the type of joint to use for the Arrjoint and Leajoint, enter the Leave Direction.

    5. In the Leave Direction specify the axis to be used. Valid axes are E (East), N (North), U (Up), -E (negative East), -N (negative North) or -U (Negative Up).X, Y, Z, -X, -Y or -Z.

    6. In the Connect list, select Connect or Unchanged:

      • Select Connect (default when Create is selected) - connects the piece of HVAC to the previous one.

      • Select Unchanged (default when Modify is selected) - positions the component at the co-ordinates 0.00.

      Note: Unchanged is usually used, when Modify is selected, it does not connect the component but positions it at 0.00, in effect in a floating position.

    7. Select Defaults to reset all the fields back to when the Breeches Threeway window was opened.

    8. Select OK to create the Breeches Threeway component and close the Breeches Threeway Window. You will be returned to the HVAC Window.

    9. Select Cancel to discard all field changes and close the Breeches Threeway window.

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