Non-Opaque Venetian Blind +90 Calculation Error

Last Updated: 
Tuesday, September 5, 2017

Software/Versions Affected:

Calculating a Venetian blind with the following characteristics will result in an incorrect answer:

  • Slat material is not opaque (transmittance front and back, visible and solar > 0)
  • Slats tilt angle = +90
  • Slat spacing > slat width (so that there is space between the slats in the vertical (+90) position)

Solution: model this case with tilt set to either -90 or +89 and the result will be correct.