Revit duct TAG velocity error

[mike]

Hi all,

I am having problems getting the duct tag to show the correct velocity of a duct with internal lining.

It is correct when tagging a duct that is not lined. When the duct is lined it shows the wrong value, using the overall duct size.  However the internal figures are correct.  Revit just displays the incorrect velocity. 

Hope the attached image is displayed and makes this cleared.

Any help much appreciated.

Mike

 

[mike · Accepted solution]

This has been reported to Autodesk support and may be fixed in a future update.  It seems to be caused by duct taps.

As a work around the duct can be split before the tag.