Flip control for duct fittings/duct accessories

[sean.liao]

Hi,

I am finding it difficult to deal with when I flip a duct fitting or duct accessory it keeps telling me the duct is connecting to the wrong direction. I tried to find the cause by examine those families that flips and those don't. For example, I checked whether connector distance is symmetrical, if connectors are linked, I switched the primary connector and checked if the model is not symmetrical to the (Left/Right) center plan will make an impact. But after checking all of above I still can't figure out why some duct fitting/accessories flip without any problem and some always give the wrong direction error...

Any more ideas?

[Cory.Killpack]

I would second this observation and add that some pipe fittings/accessories misbehave similarly. To date I have not been able to figure this one out. Any direction would be most appreciated.