Branch features represent junctions whose path is defined by branching components, such as tees, wyes and crosses. The location that you select can be on the duct surface for a square cross section or the centerline of the duct for a round cross section. When you locate the point on a duct surface, by default the software aligns it with the centerline of the duct. The third port of a branch feature will always, by rule, constitute a new run that is independent of the header connections. When you change routing direction, the software automatically changes the branch surface.