Flow rate while duct adding

[fli]

Hello. I have an issue. When I add a duct with assigned flow rate value in the properties pallette, the flow rate changes to "0" after the duct adding is done. My software is Autocad MEP 2012.

[acld]

The reason why Autocad keeps changing back to a flowrate of 0 is that there is not connected a fitting. It is the fitting that dictates the flow in the ducts. so ad a part MVPART and assign the flow and you will get the flow in the ducts

[nawarhashim82]

Hi I have the same problem that I finished a 1-line routing. The ducts are connected appropriately, then I discovered that some of them have the value of zero and the value is unchangeable. Have you found a solution for this issue that you can advise me. Thanks