Transition

Based on start shape of segment, a route can have three possible transition scenarios as listed below.

Remember: All transition Offset Options are driven by the Duct placement justification option.

Rectangular start

Auto-fitting default behavior for routes starting with rectangular shaped segments.

Fig ID	Transition to Shape	Change Size/Justification	Auto-Placed Fitting [catalog item name]
1	Rectangular	No	None
2	Rectangular	Change size	Symmetrical rectangular transition [centric reducer]
3	Rectangular	Change size and justification	Eccentric rectangular transition [centric reducer]
4	Round	Diameter equal to larger dimension	Symmetrical rectangular to round transition [RectToRnd]
5	Round	Diameter greater than larger dimension	Symmetrical rectangular to round transition [RectToRnd]
6	Round	Diameter greater than larger dimension with a justification change	Eccentric rectangular to round transition [RectToRnd]
7	Oval	No	Symmetrical rectangular to oval transition [RectToOval]
8	Oval	Change size	Symmetrical rectangular to oval transition [RectToOval]
9	Oval	Change size and justification	Eccentric rectangular to oval transition [RectToOval]

Auto-fitting default behavior for routes starting with round shaped segments.

Fig ID	Transition to Shape	Change Size/Justification	Auto-Placed Fitting [catalog item name]
1	Round	No	None
2	Round	Change size	Symmetrical round transition [centric reducer]
3	Round	Change size and justification	Eccentric round transition [centric reducer]
4	Rectangular	Width or depth equal to diameter	Symmetrical rectangular to round transition [RectToRnd] Connect point ID's reversed compared to rectangular to round transition scenario.
5	Rectangular	Width and/or depth greater than diameter	Symmetrical rectangular to round transition [RectToRnd] Connect point ID's reversed compared to rectangular to round transition scenario.
6	Rectangular	Width and/or depth greater than diameter with a justification change	Eccentric rectangular to round transition [RectToRnd] Connect point ID's reversed compared to rectangular to round transition scenario.
7	Oval	Width or depth equal to diameter	Symmetrical round to oval transition [RoundOval]
8	Oval	Width and/or depth greater than diameter	Symmetrical round to oval transition [RoundOval]
9	Oval	Width and/or depth greater than diameter with a justification change	Eccentric round to oval transition [RoundOval]

Auto-fitting default behavior for routes starting with oval shaped segments.

Fig ID	Transition to Shape	Change Size/Justification	Auto-Placed Fitting [catalog item name]
1	Oval	No	None
2	Oval	Change size	Symmetrical oval transition [centric reducer]
3	Oval	Change size and justification	Eccentric oval transition [centric reducer]
4	Rectangular	No	Symmetrical rectangular to oval transition [RectToOval] Connect point ID's reversed compared to rectangular to oval transition scenario.
5	Rectangular	Change size	Symmetrical rectangular to oval transition [RectToOval] Connect point ID's reversed compared to rectangular to oval transition scenario.
6	Rectangular	Change size and justification	Eccentric rectangular to oval transition [RectToOval] Connect point ID's reversed compared to rectangular to oval transition scenario.
7	Round	Diameter equal to width or depth	Symmetrical round to oval transition [RoundOval] Connect point ID's reversed compared to round to oval transition scenario.
8	Round	Diameter is greater than or less than width and/or depth	Symmetrical round to oval transition [RoundOval] Connect point ID's reversed compared to round to oval transition scenario.
9	Round	Diameter is greater than or less than width and/or depth with a justification change	Eccentric round to oval transition [RoundOval] Connect point ID's reversed compared to round to oval transition scenario