Revit 2022 Duct Fittings and ASHRAE Tables

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I find there is some confusion in the industry about Revit using ASHRAE tables for pressure losses in duct fittings. After a bit of investigation, I found the following post, which I believe should be of interest to anyone in the MEP discipline and who want to use Revit for more than just a drafting tool.

Autodesk, Micrographics, Revit 2022, MEP Duct Fittings Loss Factors, ASHRAE, Limitations

Please vote for the idea to improve Revit (posted on the same link)

Consider that the pressure drop through a tap might be a much as 40%. If this loss is not accounted for, the pipes will not be sized as required.

Some further reading on the matter:

My advice would be to consult the pressure loss report.

Autodesk, Micrographics, Revit 2022, MEP Duct Fittings Loss Factors, ASHRAE, Limitations

If it is picked up that some duct fitting does not induce a loss on a section of the route where it should, then some compensation must be made for that. Select the element by its ID and consider it carefully.

Autodesk, Micrographics, Revit 2022, MEP Duct Fittings Loss Factors, ASHRAE, Limitations

Ten to one it is not calculating a loss factor.

Autodesk, Micrographics, Revit 2022, MEP Duct Fittings Loss Factors, ASHRAE, Limitations

Autodesk is aware of the limitation and users should vote en masse so that they have the incentive to fix it. Users should play a much more active role in giving feedback through the ideas in Revit. Your vote matters.

If you need help adopting Revit and BIM in your practice, please contact Micrographics so we may be of assistance.

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