Side/Center:
Side ... Bow ends with back edge at 2nd system-point.
Center... Bow ends centric at 2nd system-point.
Rotation:
Shows the new direction of construction in degrees.
The direction can be manually rotated for rectangular ducts with these buttons
in four main directions (up, down, left, right).

With this function you can change between a through-fitting tee and a cross fitting tee.
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