revit mep conducted

[dario_a.rinella]

I'm a profane, someone can tell me how to set the default air pipe sections before creating an automatic layout between air and diffusers, I don't understand why (or better I guess it depends on the type of calculation, velocity, press cost, etc) always takes me a diameter of 1100 mm even if I change plant and then flow
thanks in advance to those who can help me

 

[Alfredo Medina]

the diameter of the conduit is inherited from the diameter of the connector specified for the device.