I cannot get Revit to calculate the pressure loss in any of the return ductwork I have. The supply ductwork works great but for some reason I am getting the error---- "It is not possible to calculate the flow since the flow direction mismatch. Please check flow direction on all equipment in this system." even though I have gone through the ductwork, and everything seems to be perfect. Attached is the file if anyone is able to help.
It sounds like you’re facing a frustrating issue with the return ductwork. One thing to double-check is the flow direction of each component in the system, especially around fittings and equipment connections. Sometimes a small detail can be easy to overlook. Also, ensure that the return air terminal devices are correctly set up, as a mismatch there could trigger this error. If everything looks correct and the issue persists, it might be helpful to isolate and troubleshoot sections of the ductwork individually. Good luck!
Maybe you didn't look in their model but the return diffusers had the wrong flow direction.
As I said:
The connectors on return diffusers should be OUT, not In.
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