MEP annotation scale problem

[peerawit.ru]

Hi everyone 

I try to create MEP family that unsymmetrical when i changed primary of connector and load into project then symbolic change too.

How are explained that Revit use annotation scale reference from what?

I think this function try to scale symbolic from setting but i don't know it scale form what logic? 

thank for your recommend

[fabiosato]

Hello,

I believe the scale considers the origin point of the family.

[iainsavage]

I think it is roughly the printed size of the fitting on a sheet based on the symbols hosted on the same planes as the pipe connectors in the family.

So if you have a valve which is symetrical around the Centre Left/Right plane and the setting is 3mm then on a sheet the symbol should be (about) 3mm long.

I don't think its a precise science though.

If you have a fitting which is not symetrical the results become a bit weird.

Here's an old post which is on a similar topic

https://forums.autodesk.com/t5/revit-mep-forum/single-line-valve-symbol-size-and-masking-pipe-ends/m...