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Return Duct Calculation Error

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Message 1 of 4
Christian_Farley
174 Views, 3 Replies

Return Duct Calculation Error

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. 

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Message 2 of 4

The connectors on return diffusers should be OUT, not In.

iainsavage_0-1721253439484.png

 

 

Message 3 of 4

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!

 

Message 4 of 4
iainsavage
in reply to: rostanchase14

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.

iainsavage_0-1723817100351.png

 

 

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