Short videos show how to adjust standard duct length in Fabrication Database used in Revit.
Despite the default 1500 mm channel length set in the Revit MEP Metric Content V2.2 configuration, using the Optimize Lengths option in Revit, channels are divided into sections with 1404 mm length. This is because Connector TDC CM at the beginning and the end of the duct has set Turnover 48 mm. When we change it to 0, then Reload Configuration in Revit is done, from this point the duct sections will have the desired length of 1500 mm.
Source: Autodesk
