WindandStackOpenArea - How does Honeybee determine the "Height difference" parameter in EnergyPlus?

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How does Honeybee determine the Height Difference parameter of the WindandStackOpenArea objects?

Looking at the IDF file, it appears that:

  1. Honeybee defines one WindandStackOpenArea object for each exterior wall (i.e. if there are several windows on that wall, Honeybee considers them as one)
  2. For the height difference to the neutral plane, it uses the height of the bounding box of the windows of a given wall:
    sdf
    sdf2362×944 95.7 KB

Is this correct, and if so, what is the rationale?