UPDATE – Revit MEP Error: Invalid Duct Fitting K-Factor Database

Back in February, I posted an article with a suggested fix to this error that occurs in Revit MEP when selecting or drawing ducts, fittings, or equipment.  The fix involved running Revit MEP as an administrator.  In other cases, when this issue occurred in 2009/2010, we had users uninstall/reinstall both versions, which resolved the problem most of the time.

Recently, we have had several reports of this error happening in 2011, and in most cases, neither of these recommendations have fixed the problem.

Generally, this error is a result of a 3rd-party DLL not being registered properly when installing Revit MEP 2011.  Following are the steps to manually register the DLL, which should clear the above error:

 

1. Click on Start…Run
2. Type regsvr32 "C:\Program Files\Autodesk\Revit MEP 2011\Program\ASHRAEDUCTDLL.dll" in the window
3. Click OK

A dialog box indicating that the DLL was registered successfully should appear.  If not, please proceed to the steps below.

1. Click on Start…Programs..Accessories
2. Right-click on Command Prompt
3. Select Run as…
4. Select Administrator
5. In the command prompt, type CD \ to get back to the root of C:
6. Type cd Program Files\Autodesk\Revit MEP 2011\Program 
7. Type regsvr32 “ASHRAEDUCTDLL.dll"

After confirming that the DLL registered successfully, launch Revit MEP to confirm that the error no longer appears.

Comments

[cridder]

The 2011 fix above seems to fix the error in 2009 also.

[Nike Air Max Wright]

Mistakes and setbacks, we wiser, our feeling is better. Any party, any individual, Error is unavoidable, We require make less. Mistakes are requested more rapidly and correct, The more thoroughly, The better.

[Alan Jackson]

Well I believe to have found atleast one of the culprits to this error. The ASHRAE software for their Duct Fitting Database also contains the ASHRAEDuctDLL.dll file for the program so they appear to be in conflict after installation of the ASHRAE software. Is Autodesk aware of this conflict?