This doesn't give me much confidence in the output from revit. At the moment some of my systems are over calculating and some are under calculating the pressure drop by around 15% in revit. For instance for a mitred bend Revit uses CR3-17, which is actually a Z shaped elbow and not CR3-6 which is a mitred bend. I have also done a check calculation manually and the fittings Revit MEP is using is different ASHRAE fittings to those it should be using. I've set up a duct system and used revit MEP to calculate the pressure drop through the system. I know this has been raised before but the thread is now closed
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