topic Re: OmniClass doubt in Revit Architecture Forum

OmniClass doubt

norbert_szlezak — Thu, 04 Nov 2021 14:48:43 GMT

Hello all,

what's the difference between Revit OmniClass and downloable OmniClass Database table 23? Why these two classifications have the same name in common, but different values? How to understand the Revit Category column D? Does anyone have a source which would neatly explain it? I've been trying to solve this one out but I still can't say how (and if) these two specifications cooperate.

Re: OmniClass doubt

ToanDN — Thu, 04 Nov 2021 15:27:04 GMT

The one comes with Revit is outdated.

https://knowledge.autodesk.com/support/revit/troubleshooting/caas/CloudHelp/cloudhelp/2017/ENU/Revit-Troubleshooting/files/GUID-BA0B2713-ADA0-4E51-A7CD-85D85511F3ED-htm.html

Re: OmniClass doubt

norbert_szlezak — Mon, 08 Nov 2021 07:06:02 GMT

Thanks for the source, it's clear now (and weird that it's not updated in Revit by default). Out of curiosity though. If I download and use new OmniClass, will it be visible for other users once they open their projects? I will check it out, but it seems the most secure way to include this OmniClass number would be to set it both in the parameters and in the family properties.

Re: OmniClass doubt

ToanDN — Mon, 08 Nov 2021 17:07:45 GMT

@norbert_szlezak wrote:

Thanks for the source, it's clear now (and weird that it's not updated in Revit by default). Out of curiosity though. If I download and use new OmniClass, will it be visible for other users once they open their projects? I will check it out, but it seems the most secure way to include this OmniClass number would be to set it both in the parameters and in the family properties.

No. OmniClass database file is installed at user's local folder by default so you would have to replace that file for every user unless you can somehow make every Revit station looking for a centralized file.

Re: OmniClass doubt

1225589599 — Thu, 26 Jun 2025 07:54:44 GMT

hello there!

could you please share the "Omniclass table 23" with me if you have it?

Thanks a lot!

Re: OmniClass doubt

norbert_szlezak — Thu, 26 Jun 2025 08:05:13 GMT

Hey, you can find it here: https://forums.autodesk.com/t5/revit-mep-forum/omniclass-table21/td-p/10906876

Inside it are all the tables, including Pr 23.

As for Revit one, it's downloaded automatically and you can find it here: C:\Users\<username>\AppData\Roaming\Autodesk\Revit

The file is called "OmniClassTaxonomy"